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Frequently Asked Questions for Air Purifier

1. How does an air purifier work?

An air purifier sucks the air inside the room , polluted air passes through all the filters and comes out from outlet as clean air.

2. Where to install the air purifier in the room for better result?

Keep it on the floor atleast 6 inches away from the wall.

3. Can air purifier and air conditioner be used in the same rooms?

Yes both the devices can be used in the same room, but you must ensure that air purifier is not kept just below the air conditioner.

4. Does it work as exhaust in the kitchen?

No, it is not meant to be used as an exhaust in the kitchen.

5. Can air purifiers be used in toilets?

Yes it can be used in the the toilets, but with specific configuration of filteration technology.

6. Is there any child lock in the unit?

No there is no child lock.

7. What is the right place to keep air purifier in the bed room?

Keep at least two to three feet away from the bed for better and instant relief from pollutants.

8. How many hours it should run continuously.?

It can run continuously for 24 hours, but to give a rest for half an hour is good for machine.

9. How much is the life of the changeable filters ?

Changeable filter life is 08 to 12 months ( Depend upon usage and environment )

10. What is the role of UV tube in an air purifier ?

U. V. Tube kills bacteria and virus.

11. Is Ionization emitting ozone ?

No this it does not emit any ozone.

12. What does an activated Carbon do in an air purifier?

An activated carbon absorbs odor and smoke present in the room.

13. What do you mean by PCO Filter?

PCO is Photo catalyst oxidization filter. This oxidizes the pollutants in the air when it interacts with U.V. Tube.

14. What do you mean by Anti Bacterial Filter?

Anti Bacterial Filter is for eliminating bacteria up to 5 micron size.

15. What grade HEPA you are using?

Atlanta Healthcare air purifiers use H13 grade HEPA filter

16. How should we know the quality of HEPA is good?

HEPA Filter starts from H 06 to H 13 grade. A good Hepa consists of many mini pelets and maximum surface.

17. HEPA is made up of what material?

A good hepa filter is made up of impregnated glass fibre.

18. What micron particles HEPA can Eliminate?

A HEPA can eliminate up to 0.03 micron size pollutants.

19. What is the meaning of PM 2.5?

P.M2.5 stands for particulate matter size up to 2.5 micron.

20. Which Gases can be removed by using air purifiers?

It removes carbon monoxide, Hydrogen Sulphide, Ammonia, Sulpher Oxide, Nitrogen Oxide , vehicular emmission and VOCs.

21. What is ULPA Filter? How is it different from HEPA?

ULPA Filter stands for Ultra Low Particulate Air, it can eliminate pollutants up to 0.01 micron size.

22. What does a Humidifier do?

A humidifier insreases the level of moisture in the room. This is to use in peek winter and summer season.

23. How much is water tank capacity in humidifier?

The water tank capacity in Universal 450 is 1.08 litre.

24. Does your air purifier come with remote control?

Yes, all Atlanta Healthcare air purifiers come with remote control function.

25. Does it display PM 2.5 measurement?

No, it does not display PM 2.5 measurement.

26. What is the noise level of machine?

Atlanta Healthcare air purifiers have noise level < 42 decibles.

27. What is the difference between air flow and CADR?

Air flow is a measurement of amount of air per unit of time that flows through an air purifier. CADR is clean air delivery rate .

28. How would we know the performance of machine?

Two methods: first is to feel the difference and second is to measure with an air quality monitor.

29. Which technology you use in your air purifiers?

Our air purifiers are equipped with advance iCluster technology.

30. What is the maintenance of using an air purifier?

You have to ensure that you clean its filter once in a month with help of a vacuum cleaner.

31. How much is the warranty of your air purifier?

Warranty of our air purifier is one year.

32. What about dealer and service network in India?

We do have our Distributors/ Dealer in Mumbai, Delhi, Bangalore, Hyderabad, Kerla, Tamilnadu, Delhi, Gurgaon, Ghaziabad and Patna

FAQs for Cambridge N99 pollution mask

1. What is Atlanta healthcare Cambridge N99 pollution mask?

Air pollution masks help you protect against gas based pollution, such as smells, benzene and formaldehyde, particle pollution such as PM2.5, pollen or smoke and pathogens such as viruses and bacteria. Ideal for cyclists, people in at risk groups for respiratory disease or anyone living in urban environments with high air pollution level. Currently available in 35 countries across the world. The brand is from the UK.

2. What is unique about Atlanta Healthcare Cambridge mask?

Atlanta Healthcare Cambridge Masks are N99 tested and they filter out dust, pollution particles such as PM10, PM2.5 and PM0.3 and bacteria by its unique Triple Filtration System.

Atlanta Healthcare Cambridge Masks™ have been treated with silver, which means they block and kill 99.77% of micro particles such as airborne bacteria.

3. What is the technology behind Cambridge N99 Pollution Mask?

The triple layer filtration technology behind these masks are developed by Ministry of Defence in the UK.

4. What is the triple filtration system (UK Technology)?

The Triple Filtration System consists of three layers: The Primary Filter Layer, Three-Ply Micro Particulate Filter and Military Grade Carbon Filter.

Triple Layered Filtration System

The Primary Filter Layer :
Eradicates larger pollution particles such as Dust and PM10.
Three-Ply Micro Particulate Filter :
Stops 100% of small particulate matter such as PM2.5, PM0.3.
Military Grade Carbon Filter :
Invented by UK’s Ministry of Defence and it keeps out viruses, bacteria and gaseous pollutants such as VOCs, Ozone, Benzathine and Formaldehyde.

Pollution clouds contain particles and gases, which are trapped by the particulate layer and fully absorbed by the military carbon layer.

5. What is the average usage life of these masks?

These masks can be used up to 200 breathing hrs in moderate pollution levels. These masks have expiry of 4 years if unused.

6. Can they be washed?

Yes, these masks can be washed using lukewarm water and mild detergent. These masks are reusable but need to be discarded if you experience difficulty in breathing.

7. How to wear these masks?

Masks come with ear-loops and a nose clip. Each size is based on weight of the person, please refer to size chart for accurate size that fits you. Once worn, you need to press the adjustable nose clip against your nose and make a seal across the mask so no bad air is leaked in and you are only breathing through the mask. Please ask for adjustable head strap to fix your mask better on your face and secure properly.

8. What does the mask protects me against?

  • Air pollutants, Dust, Pollen, Smell, Smoke and other Airborne Allergens

9. Where can I use my air pollution mask?

  • Running and Jogging
  • Cycling
  • Outdoor Activity for Kids
  • Hospitals
  • Air Borne Diseases
  • Travelling in public transport (bus/metro)
  • Biker
  • Industries

10. How many valve option are available in mask?

Available in three valve options : No valve , one valve, three valve.

11. What is the advantage of 2 Valve mask?

Valve is used for exhalation. Mask with 2 exhalation valve helps you exhale better during strenuous physical activities such as running, jogging, playing outdoor, It also helps ease the fogging in case you wear spectacles.

12. What are the sizes mask is available in?

XL   90+ kg

L    65 – 89 kg

M    33 – 64 kg

S    11 – 32 kg

XS   6 – 10 kg

Frequently Asked Questions for AirVisual Node

1. What is Atlanta Healthcare AirVisual Node? What does it do?

The Atlanta Healthcare AirVisual Node is an “all in one” air quality monitoring solution that displays immediate, accurate air quality data both indoors and out, to help you create healthier, more productive environments.

As the most precise consumer air quality monitor on the market, the Node displays real-time PM2.5 and CO2 readings along with air quality forecasts, outdoor air quality insights and phone alerts. It also measures temperature and humidity.

Placed indoors, your Node provides insights into your indoor environment’s air quality and contrasts this with local outdoor air quality. The Node then gives tailored recommendations to optimise a healthy environment, such as alerting you to open windows and ventilate when CO2 builds up indoors, run an air purifier when indoor PM2.5 is high, or advising when you should exercise outdoors.

Placed outdoors, your Node can become a public outdoor air monitoring station, sharing its air quality data with a global network to hugely benefit your community and beyond. It is the only air monitor to provide air quality forecasts 3 days in advance, allowing you to plan your activities to optimize health and wellbeing.

Track your Node’s data on-the-go using the AirVisual app or website, and invite your friends and family to follow it too.

2. What technology does Atlanta Healthcare Airvisual Node use?

  • High precision laser to counts particles in the air, which is then processed with a unique algorithm to calibrate for external factors such as temperature, humidity and outliers.
  • Bright LED display compares indoor readings with outdoor data, from the nearest official station, by collecting cloud data so users know when to ventilate, go outside or stay inside.
  • Air-flow control fans provide more stable readings and improved durability.
  • Three-day air quality forecasts driven by in-house artificial intelligence enable users to proactively minimize exposure to outdoor air pollution.

3. What all does the Atlanta Healthcare Airvisual Node detect and to what efficiency?

  • PM2.5: 0.3μm to 2.5 μm (particulate matter pollution between these diameters)
  • CO2 (Carbon dioxide): 400ppm (parts per million) to 10,000ppm
  • Temperature: -10°C to +40°C; 14°F to +104°F
  • Humidity: 0-100%

4. Can the node be used outdoor?

Yes, however, in order to get the most accurate information from outside, it’s important that weather (including rain, wind, temperature and direct sunlight) does not interfere.

5. What precautions need to be taken while placing it outdoor?

When you set up a Node for outdoor use, it needs to be protected from exposure to water, strong wind and direct sunlight, as well as have access to an electrical outlet. Optimal locations include a shaded porch or roofed balcony. The Node needs a stable and strong Wi-Fi connection.

6. What recalibration requirement is needed while placing it outdoor?

For most usage, the Node does not need to be recalibrated for outdoor placement within a year. After heavy usage in extreme conditions, or long term usage in normal conditions, a sensor replacement is necessary. It all depends on the level of accuracy a particular user want.

7. Does the sensor efficiency decrease when placing it outdoor?

Sensor lifetime is affected when outdoor conditions are frequently heavily polluted. The accuracy may also decrease if the sensor is exposed to extreme weather conditions (-10C or >40C).

8. If I place 5 Nodes beside each other, how much would the reading vary and why would the readings vary?

Generally, concentration readings will be within +-10% variation. This may be because of varying conditions across space and time, as well as sensor natural drifting.

9. What are the consumables that need to be replaced on a periodic basis?

The Node was built for durability and reliability. The only piece that would need to be changed is the sensor. The sensor replacement could be offered as a service to customers.

10. Does it work with room thermostats? Any limitations in this area?

In the near future, the Node will employ IFTTT technology to work with other IoT home devices. Thermostats, for instance, that have Wi-Fi capabilities will be able to be controlled with simple rule-based instructions.

11. How many cities can I monitor against my home in the Node?

One, on the Node’s screen itself. It is recommended that you select an outdoor station closest to where you live, so that you can use the Node to compare indoor and local outdoor quality, and optimise your activities accordingly. E.g. when indoor air quality is poor but outdoor is good, open windows to ventilate.

If you wish to monitor other cities simultaneously, you can do so using AirVisual free mobile app.

12. What are the ratings configured for US and China in terms of AQI, PM2.5 and CO2?

US and China AQI are generated by different air pollution equations. The US AQI typically yields higher AQI values under 200, for the same PM2.5 concentrations, and for this reason is regarded as the more stringent (recommended) system. **Guidelines are based on inhaling specified level of air quality for a 24-hour period.


  • AQI: 0-50
  • PM2.5 concentration: 0-12 ug/m3 (US AQI);
  • Little to no health risk
  • AQI: 51-100
  • PM2.5 concentration: 12.1-35.4 ug/m3 (US AQI);
  • Sensitive individuals may experience irritations
Unhealthy for SG
  • AQI: 101-150
  • PM2.5 concentration: 35.5- 55.4 ug/m3 (US AQI);
  • Sensitive groups should limit outdoor exertion
  • AQI: 151-200
  • PM2.5 concentration: 55.5-150.4 ug/m3 (US AQI);
  • Harmful for sensitive groups, reduce outdoor activity for everyone
Very Unhealthy
  • AQI: 201-300
  • PM2.5 concentration: 150.5-250.4 ug/m3 (US AQI);
  • Everyone can be affected. Avoid heavy outdoor activity.
  • AQI: 301+
  • PM2.5 concentration: 250.5+ ug/m3 (US AQI);
  • Serious risk of respiratory effects. Everyone should avoid outdoor activities.

For CO2, there is no AQI standard as such. Based on the literature about Co2, AirVisual designed this standard:


  • CO2: CO2 < 700 ppm
  • Ideal comfort level
  • CO2: 701-1,000 ppm
  • May experience stiffness and odors
  • CO2: 1,001-1,500 ppm
  • General drowsiness
  • CO2: 1,501-2,500 ppm
  • Fatigue and reduced concentration
Very Unhealthy
  • CO2: 2,501-5,00 ppm
  • Headaches and adverse health effects expected
  • CO2: 5,001-10,000 ppm
  • Quickened breathing, nausea

13. How accurate are the humidity and temperature sensors?

Humidity sensor +/- 10% of actual value. Temperature +/- 1 C. The Node needs to run for 5 minutes to have a reliable humidity and temperature reading.

14. How does the Node predict the future AQI?

Air quality forecasts are generated by using machine learning, a subset of Artificial Intelligence, technologies. These predictions are derived from factors such as historical information, weather trends, wind movement, geography, human behavioral patterns and current air pollution readings in surrounding areas. By recognizing trends in past conditions and outcomes, our computers are able to predict future conditions. All of this information is provided on the device’s screen – as well as on our free app and website – so that users can plan ahead and optimize your well-being when outdoors.

**This forecasting model, and all resulting air quality predictions, is intended to provide accurate information related to air quality. Steps have been implemented to ensure its quality and accuracy – however, there are some limitations. Please read AirVisual’s air quality forecast method and disclaimer for more information.

15. Is the Node water resistant?

The Atlanta Healthcare Airvisual Node is NOT waterproof; by design it needs air flow into the sensor.

16. If I have to put it outdoor, what caging/covering is required?

Outdoors the Node should be sheltered from rain, wind and direct sunlight. Any caging or covering protecting the Node from these 3 elements, and allowing adequate airflow, should suffice.

17. How do I display the content of my node on a TV screen? Do we have to pay extra for it?

The Node itself cannot be connected to a TV. Data can be displayed on televisions via an HTML based widget. The price of the Widget depends on the level of customization required.

18. How many Nodes can I connect to my phone under one single account?

3 nodes can be connected to a single account. For more, we will charge the enterprise fee.

19. What are the platforms that the Air Visual App works on?

Android, iOS, web-based. The app can be downloaded via the Apple App store, Google Play, or Android markets.

20. If there is no wifi connectivity to the Node then how can I sync the data to my phone?

Without Wi-Fi connectivity there is no way for a Node’s data to sync with a phone. Both phone and Node must be connected to the internet by some means for data to be shared between the two devices.

21. Is there a Bluetooth connectivity through which I can sync data?

No Bluetooth, just Wi-Fi connectivity.

22. How can I share the data of my Node with my friend?

You can follow the data from your friend’s, or anyone’s Node by ‘Adding’ their Node to your online profile (through the website or app). To do this you’ll need to ask the Node’s owner for their ‘share code’.

To find your Node’s share code, sign in to your profile on the AirVisual website. Once your Node has been added to your profile, click on your name tab and select ‘My Nodes’. On the desired Node, click on the ‘Share’ button in the top right corner. This will display the Node’s share code.

23. What are the API’s available that can be integrated with website/other applications?

For more information visit

24. Can I get a PDF report for a set of days/months/year including the readings of my Node?

The Node stores data for up to 5 years. This data can be downloaded at any time by connecting to samba, and accessing the data from a computer. The data is downloaded as a .txt file, with comma-separated values. To get a PDF report, it is necessary to import this data into Excel or another program, and save as a PDF.

Alternatively, it’s possible to view value-added reports of your Nodes data, divided into days/months/years by going on the website. It’s technically possible to get this type of PDF report with customization and probably a fee.

25. Can one Node be configured with more than one mobile phones/display screens?

Each Node can only be registered to one account (mobile phone is irrelevant, but the “owner” must be logged in). There is no limit, however, to how many user profiles can follow one Node.

26. Can all my family members configure the same Node on their mobile numbers?

Anyone with a Node and the AirVisual app is able to configure the Node’s Wi-Fi. Only one registered user account can control the Nodes settings through the app. There is no limit on how many user profiles can follow one Node, using the mobile app or website.

This is particularly useful to share a Node to the classroom of student’s parents.

27. What is a share code?

A share code is a unique code for providing others access to the data on a given Node.

You can follow someone else’s Node’s data on the mobile app by: clicking the “+” on the top left of the app homepage, navigating to “Add a new Node” and then entering its share code.

To find your Node’s share code, sign in to your profile on the AirVisual website. Once your Node has been added to your profile, click on your name tab and select ‘My Nodes’. On the desired Node, click on the ‘Share’ button in the top right corner. This will display the Node’s share code.

28. How many devices can I share the data of my Node?

There is no limit on how many user profiles can follow one Node.

29. What is pairing mode and how does it work?

Pairing mode is the term given to when the Node has activated its internal Wi-Fi hotspot. This is used when a user would like to configure the Node’s Wi-Fi through the mobile app. When a Node is in the Initialization Wizard (first time use), Pairing mode is automatically activated. If a user is not in the Init Wizard, they can cue pairing mode by holding down the center “ok / menu” button for 3 seconds.

Once the Node’s Wi-Fi has been successfully configured through the mobile app, the internal Wi-Fi hotspot will deactivate and the Node will exit pairing mode.

30. I do not have an outdoor air quality monitor near my house. How do I know the air quality?

The Node is able to display data from any of the 8000+ outdoor air quality monitor stations listed – whilst this number is growing all the time, there are still large gaps in global air quality coverage. That is the problem we are addressing with our Nodes!

You can use your Node to monitor air quality anywhere, indoor or outdoor – as long as the Node remains protected from weather (wind, sun, rain, temp). The exciting thing about outdoor monitoring is that if you connect your Node to Wi-Fi, place it in a sheltered outdoor location (e.g. shaded and weather-protected windowsill or porch), you can choose to share your data and become a public air quality data source in your community.

31. Which microprocessor and version of Arduino being used?

We use Allwinner A33 microprocessor. We do not use Arduino.

32. What is the temp range under which the device can operate?

-10°C to ~+40°C

33. In Nepal, temperature condition may go above 40 degrees, will it operate in such extreme conditions?

We do not guarantee accuracy, usage or product protection above 40°C.

34. How does it respond to < 0 degree temperatures?

The Node can handle temperatures down to -10°C. Beyond -10°C Atlanta Healthcare Airvisual cannot guarantee the validity of the data shown, proper usage, or general protection of the Node’s hardware components.

35. If the temperature is outside the operating range, then what happens?


36. What is the size of the screen?

5” wide LED display screen, slightly larger than an iPhone 6, 800×480 pixels.

37. What all comes in the box?

The box includes an outer box slip, box, 1 micro USB to USB cord, 1 power adapter, 1 Node, and 1 user manual.

38. Do I need to undertake any periodic maintenance of the device? If so what?

Clean the Node’s exterior using a slightly damp cloth and use its power saving mode to extend the sensors lifetime. To remove the dust in the sensor, you can use compressed air spray to clear the dust from photosensor.

39. Can I use the Node in moving vehicles? If NO, why?

The Node can be used in moving vehicles, however, readings may be affected by strong winds, which deceive the sensors calibration for air volume. The most accurate readings will result when the Node is covered from wind (for instance, when the vehicle’s windows are rolled up). Using the Node inside the car with windows closed (no wind blowing on the sensor) is fine.

40. Can I change the brightness level?

Yes. To change brightness levels, press the center “OK / Menu” button, then click Display > Screen > and adjust the brightness level.

41. Does Node have a touchscreen?

No, the Node’s screen is meant for clean, clear display and as a result was not designed to be a touch screen.

42. Can I plug n play additional sensor into the Node?

No, additional sensors cannot be plugged into the Node. We strongly discourage all users from tampering with the Nodes internal components.

43. Why do organisations need the Node and what are its uses?

The Node has many different uses for organisations:

  • The Node can be used to monitor and improve the air quality in work spaces, enhancing productivity, concentration and morale.
  • Any business with customer interaction can display a Node at its counter, reception desk, or any other visible spot: this will add value to customer experience, convey an aligned mission for health and wellbeing, and drive a unique competitive advantage.
  • Businesses can also display the Node to show off their superior air quality, advertising their premises as healthy spaces.
    • Additionally, they can publish their Node’s share code, so that customers can follow the business’ indoor air quality – excellent additional advertising, and a constant reminder of the business on the customer’s phone (app).
  • Businesses can also use the Node as a public, outdoor air monitoring source, again generating broad advertising for their business on the global air monitoring network, and adding great value to their community, and customers. Particularly in areas with little air monitoring coverage.
  • Environmental / air quality organisations can use the Node as outdoor monitoring stations to generate air quality in areas with little coverage – as well as acquire and use this data with AirVisual’s API to create novel applications.

44. Why do households need the Node and what are its uses?

People spend over 90% of their time indoors, and indoor air quality is often as bad as, sometimes even worse than outdoor air quality. Knowing what’s in your home’s air is vital for ensuring the health of you and your family.

  • Monitors PM2.5, CO2, Temperature and Humidity
  • Contrasts real-time indoor with local outdoor air quality, offering tailored recommendations for you to optimize your activities in the healthiest environments, indoor and out.
  • Provides 3-day outdoor air quality forecasts, allowing you and your household to plan your activities for optimized health and wellbeing.
  • By monitoring PM2.5 levels, you can see how effectively your home is insulated against outdoor particulate pollution. High concentrations alert you to close windows, doors, and run an air purifier.
  • CO2 is an important indoor pollutant many people are unaware of. CO2 builds up in poorly ventilated spaces, and can cause headaches, lethargy, difficulty concentrating and even nausea. The Node alerts you when to open windows and ventilate your environment.
  • You can download historical data from your household’s Node to a computer, allowing further analysis of patterns and trends in your household’s air quality.
  • Poor air quality can negatively affect your sleep. Optimizing indoor air quality can energise your household.
  • Follow your household’s air quality data on-the-go using the mobile app.

45. What is the area coverage that the reading of Node is valid for? (Ex: 10m/20m/30m)

Usually, the coverage of a Node is a room (or open space) of up to 100sqm.

46. Can I clean the sensor on my own?

You can use compressed air to blow away the dust from the sensor. Apart from that, the internal components of the Node should never be disassembled or tampered with.

47. What are the Do’s and Don’ts while operating the Node?

Do: Put the Node on a flat, stable surface; Clean the Node using a slightly damp cloth; Connect the Node to an electrical outlet; Extend the sensors lifetime by using power saving mode.

Don’t: Expose to direct sunlight (even indoors); Expose to water (eg. rain) the Node is not waterproof; Expose to strong wind; Expose to extreme heat.

48. What certifications does the Node comply to? Are there any independent reputed third party agency reports certifying accuracy of the node?

The Node has FCC, CE & RoHS certification/compliance.

49. What is the accuracy of the projected AQI?

+/- 10% of actual concentration value

50. Are there any geographical terrains where THE NODE WILL NOT WORK or show accurate data?

  • The Node is not guaranteed to work above temperatures of 40-50°C, or below -10°C
  • The Node’s monitoring may lose effectiveness if exposed to weather elements, such as: rain/water, strong wind, sunlight, extreme heat.

51. Industrial standards to which Node complies?


52. Is the Node storing any data within itself? Does it have a cache memory?

The Node does store data. It’s cache memory is quite large, capable of holding up to 5 years of memory. To clear the data click the center “OK / Menu” button, and then navigate to About > Node reset > “Reset settings & clear data”

53. The data shown by the third parties i.e. US Embassy, does Node standardize the data before displaying or does it display as it is?

The Node reports outdoor air quality data as it is reported from official monitoring stations around the world (eg. US Embassy). Depending on the Node’s settings, this data can be displayed on the Node in either US AQI or China AQI.

It is worth noting that before to be published, the data goes through a validation process to remove any potential data point outliers.

54. How is Node different from other air quality monitors?

  • Personalized recommendations based on BOTH indoor and outdoor pollution conditions so user can optimize health and wellbeing.
  • The only device to display air quality forecasts on the screen
  • Has a battery and a memory to store the measurements, so that it can be used remotely- useful for experiments
  • Measures CO2, allowing users to understand how to best balance PM2.5 & CO2 (an unfortunate result of sealing your home and running air purifiers)
  • Compares indoor and outdoor AQ clearly on screen
  • Power saving mode
  • Excellent data capacity – device can log < 5 years’ data. Easily accessible and downloadable to a computer
  • Optimizes measuring precision by using algorithms to discount outlying data points, as well as account for the influence of temperature and humidity on sensor readings.
  • High precision laser sensor with airflow control fans for better accuracy

55. How is Atlanta Healthcare Airvisual Node unique?

  • The Node is the only air quality monitor to directly measure both PM2.5 and CO2, as well as offer AQ forecasts on-screen
  • Personalized recommendations based on BOTH indoor and outdoor pollution conditions so user can optimize health and wellbeing.
  • Only device to compare indoor and outdoor data from locations worldwide on-screen

56. What battery does the Node use?

Rechargable Li-Ion battery

57. What is the capacity in terms of mAH of Node battery?

1900 mAH

58. What is the battery life of Node?

The Node’s battery life will vary depending on its settings. In standard use, a Node will run for 4-5 hours. To extend the battery life of the Node:

  1. Change the screen brightness (press the center “ok / menu” button, navigate to Display > Screen > Brightness) or turn the screen off by pressing the far left button (quick press)
  2. Adjust power saving mode preferences so that the Node enters “sleep mode” at given times (press the center “ok / menu” button, Navigate to Performance > Power Saving > and change settings as you wish)
  3. Change the frequency at which the Node measures air quality (press the center “ok / menu” button, Navigate to Performance > Sensor mode > Default)

59. Does the sensor efficiency decrease when placing it outdoor?

The sensor’s efficiency may be negatively affected if the Node is exposed to certain weather elements (such as rain, wind, high temperatures and direct sunlight). However, if the Node is placed in a sheltered location (e.g. shaded porch, roofed balcony), and has battery life or a power source, then sensor efficiency should function as normal.

60. Is the charger specific to certain amount of voltage and how does it deal with excess voltage passed on?

The charger is 5V, 1amp minimum. There is a overcurrent protection for 3A.

61. What technology does PM2.5 sensor use in Node?

Atlanta Healthcare AirVisual uses a high precision laser with a photo sensor to count PM2.5 in the air. This data is then calibrated using a unique algorithm to calibrate for external factors such as temperature, humidity and outliers via the internal CPU.

62. How frequently does the PM2.5 sensor need be recalibrated?

Under normal usage, a PM2.5 sensor should not require recalibration or replacement for the first year. Depending on the user’s demand for precision, the sensor replacement can be offered as a service.

63. What technology does CO2 sensor use in Node?

Our CO2 sensor is an Infrared gas sensor (NRID) the components of which include an infrared source, light tube, interference filter and infrared detector.

64. What is the make of CO2 sensor?

Swedish made CO2 sensor

65. How accurate is the CO2 sensor?

+/- 10% accuracy

66. Can I get a VOC Sensor also built into my Node?

Yes, Nodes with VOC sensors will be offered in the near future. VOC sensors will not be built into existing Nodes.

67. Can I get a CO Sensor also built into my Node?

Not at this point in time.

68. Can I get a SOx Sensor also built into my Node?

Not at this point in time.

69. Can I get a NOx Sensor also built into my Node?

Not at this point in time.

70. Please share the structural diagram of the Node

71. Please share line diagram to show how Node can be connected to Television display

The Node itself cannot be connected, directly, to a television display. Digital signage relies on an HTML based widget, provided by AirVisual.

Frequently Asked Questions for Dehumidifier

1. What is a dehumidifier ?

Portable electric dehumidifiers, the most common and effective type available, work in a similar way to an air conditioner except the air is heated instead of cooled. A dehumidifier uses a fan to draw moist room air over a series of coils – first a refrigerated coil, and then a heated coil. As the refrigerated coil cools down the moist air, the moisture content in the air condenses into water and drips down into a collection bucket or drain hose. The now drier air then passes over the heated coil before being released back into the room as dry, warm air. A dehumidifier is most effective at warmer temperatures and higher relative humidity levels.

2. What does a dehumidifier do?

A dehumidifier removes water from the air in your home until relative humidity is reduced to the level you choose. Once it has reached this level a good dehumidifier should  automatically maintain that comfortable level with no interference from you!

3. What is relative humidity?

Relative humidity is a measure of how much water is in the air relative to the amount that air could hold if it was saturated. Relative humidity is expressed as a percentage. When relative humidity reaches 100% it is at the “dew point”. In other words the air is “full” of water and that water will start to condense onto any surface. Warm air holds more water than cool air so as air cools relative humidity rises even though the physical quantity remains constant.
For every fall in temperature of 20°F/10°C the capacity of the air to hold water is halved. For example air at 80°F with a relative humidity of 50% will reach the dew point, 100% RH when it has cooled to 60°F.

4. Where does the water come from?

Water is always in the air, inside and outside the home. The amount inside the home varies and is increased by many routine daily life activities such as cooking, washing, showering, making tea and breathing. If you have uncovered water containers in the home like fish tanks etc, then these will also add to the amount of water in the air.

5. What is the ideal humidity level for my home?

Generally a relative humidity of 50% is comfortable for your home. This will protect your home and belongings, prevent mold growth and control the dust mite population. There is no real need to reduce humidity below the 45-50% mark. To do so will simply cost more in energy while serving no useful purpose.

6. How does a dehumidifier work?

Most dehumidifiers work by drawing air from the room over a coil cooled to a very low temperature by a refrigeration system. These are commonly known as  refrigeration dehumidifiers. The water vapor condenses on the cold surface and the liquid water drips into the water collection bucket underneath.  More and more dehumidifiers are now using an alternative method known as desiccant dehumidifier. The desiccant dehumidifiers pass the air over a wheel coated with a water absorbing material ( called desiccant).  The water is removed from the desiccant by passing a stream of warm air through it whereby it is dried and re-generated to collect more moisture on its next pass. The collected water is collected in the units water collection tank.

7. How long will it take to get the moisture under control?

As long as the dehumidifier you choose is large enough for the area it is working in, and there are no specific damp problems,  then a dehumidifier will normally reduce the humidity to the chosen level within a few days to a week. This timescale does not apply if the room has been flooded, in which case one or more dehumidifiers will be needed and possibly supplemented by air movers and other specialist equipment. This work is usually undertaken by specialised water damage specialists.

8. How much water does a dehumidifier remove?

The answer to this depends on three specific factors. The power of the dehumidifier, the room temperature and also the relative humidity of the air in that room. A 12 litre dehumidifier will rarely,  if ever,  remove 12 litres in a single 24 hour period. Once relative humidity has been reduced to your chosen level the dehumidifier should only be operating intermittently to maintain that level so the amount of water collected in the bucket will be lower still.

As a general rule of thumb you may need to empty your dehumidifiers  bucket at intervals ranging from once every two days to twice a day, depending on the conditions. It is only in exceptional circumstamces that a properly sized dehumidifier will need emptying more frequently than this, unless of course you have placed it in a very damp room for the first time.

9. Can I use the water that collects in the bucket?

The water collected in the dehumidifiers tank is called condensate, you can use this in your iron or to water the plants! However, it should not be drunk by humans or animals as it may contain traces of substances that could make you, your pets ill.

10. How do I know how big a dehumidifier I need?

This is basically down to the size of the room and how wet it is. But in general you will find most dehumidifiers on our site are classed by house size to make the job easier for you to choose. For instance our smallest dehumidifiers are ideal for anything up to a 3 bedroom house. Our larger units are ideal for homes with up to 5 bedrooms. In general terms we would always recommend that you err on the side of caution and if in any doubt buy a dehumidifier a size larger than you may appear to need. Larger dehumidifiers remove more water per energy pound spent and run for fewer hours in a given space than smaller ones. The energy saving will almost certainly be greater than the difference in purchase price.

11. How does a dehumidifier prevent mold and mildew?

A dehumidifier prevents mould and mildew growth in two ways. First it dries out the room, drawing damp from the contents and fabric of the room on which mould and mildew will inevitably form and prevents that damp from recurring. Secondly, providing the dehumidifier is set to maintain relative humidity at 50% or slightly below, the air is too dry for mold and mildew spores to develop. Fungi need airborne water as well as surface water to grow!

12. Do I have symptoms of high humidity?

Symptoms can range from personal issues, such as allergic reactions, stuffiness and congestion, asthma, and respiratory problems, to long-term issues with your home, including stains on ceilings and walls, damage to your furniture, and more. If you have these issues, a dehumidifier is something you should consider.

13. How high are my humidity levels?

The best way to find the right dehumidifier for your home or warehouse space is to understand how much work it will do. Relative humidity measures the absolute highest levels of water vapor in the air (100 percent relative humidity meaning the air can hold no more moisture, which means that it is raining or foggy); when relative humidity is below 30 percent the air often feels dry, and when it is above 50 percent it will feel very muggy and uncomfortable. The most comfortable relative humidity levels are around 35 to 40 percent. To measure the humidity in your home, you can purchase a hygrometer and decide what course of action you should take based on the findings.

14. Where will I be using the unit?

If you have a fixed space where you want to use your dehumidifier, you can purchase a larger unit or one that is permanently attached to the floor or walls. If you have a need to move the unit from one room to another, or would like to take it with you when you travel, check for portable models that are lightweight and include carrying handles or wheels.

15. How do I know if I need a dehumidifier

Many basements in warm humid climates need dehumidification during the summer months to keep mold growth at bay. If you notice a musty smell or odor in a room, it will probably benefit from a dehumidifier, as drier air is not only healthier for you but will also be less likely to smell or have a stale, musty odor. A quick and inexpensive way to check the relative humidity level in any room is with a hygrometer.

16. Will a dehumidifier make my room warmer?

Dehumidifiers work much the same way as air conditioners, however unlike air conditioners, a dehumidifier does not cool the air. Instead, when the compressor inside a dehumidifier is working, it dries the air and releases it back into the room as heated air. This may increase the temperature in the room by a few degrees, but the extent to which the room temperature may rise will depend on the size of the room and the amount of time the compressor is working to remove moisture. The smaller the room, the more the air temperature will be raised, while in a large area, the effect is usually negligible.

17. Can I run a dehumidifier together with my air conditioning?

Yes, it is perfectly fine to run a dehumidifier together with an air conditioner and furnace, filter portable fan, air purifier, or any other air treatment appliance.

18. Can I drink the water collected by a dehumidifier?

While the water collected by a dehumidifier is free of any minerals or other impurities, it is not considered safe potable drinking water, as it has been drawn over a series of coils which are not sanitary, and once collected in the water container it can sit stagnant where bacteria can grow. Therefore you should not drink the water collected by your dehumidifier, nor should you feed it to your pets. However, you can reuse it for other non-drinking purposes, including gardening or watering indoor and outdoor plants.

19. How does a dehumidifier prevent mold and mildew?

It prevents mold and mildew growth in two ways. First it dries out the room, drawing damp from the contents and fabric of the room on which mold and mildew will inevitably form and prevents that damp from recurring. Second, provided that the appliance is set to maintain relative humidity at 50% or slightly below, the air is too dry for mold and mildew spores to develop. Fungi need airborne water as well as surface water to grow.

Frequently Asked Questions for N95 Masks

1. What are Facemasks/general surgical masks ?

A facemask or surgical masks is a loose-fitting, disposable device that creates a physical barrier between the mouth and nose of the wearer and potential contaminants in the immediate environment. Facemasks are not to be shared and may be labeled as surgical, isolation, dental or medical procedure masks. They may come with or without a face shield. Facemasks are made in different thicknesses and with different ability to protect you from contact with liquids. These properties may also affect how easily you can breathe through the facemask and how well the facemask protects you.

If worn properly, a facemask is meant to help block large-particle droplets, splashes, sprays or splatter that may contain germs (viruses and bacteria), keeping it from reaching your mouth and nose.  facemasks may also help reduce exposure of your saliva and respiratory secretions to others. While a facemask may be effective in blocking splashes and large-particle droplets, a facemask, by design, does not filter or block very small particles in the air that may be transmitted by coughs, sneezes or certain medical procedures. Facemasks also do not provide complete protection from germs and other contaminants because of the loose fit between the surface of the facemask and your face.

Facemasks are not intended to be used more than once. If your mask is damaged or soiled, or if breathing through the mask becomes difficult, you should remove the facemask, discard it safely, and replace it with a new one. To safely discard your mask, place it in a plastic bag and put it in the trash. Wash your hands after handling the used mask.

2. What is an N95 mask?

A: An N95 mask is a disposable filtering facepiece respirator with two straps. When worn properly (with the mask making a tight seal with the user’s face), it can protect against hazardous airborne particles. N95 masks do not protect against gases, vapors or asbestos, and they do not provide oxygen. The “N” designation means the mask is not resistant to the effects of oil mists.

An N95 respirator is a respiratory protective device designed to achieve a very close facial fit and very efficient filtration of airborne particles. The ‘N95’ designation means that when subjected to careful testing, the respirator blocks at least 95% of very small (0.3 micron) test particles. If properly fitted, the filtration capabilities of N95 respirators exceed those of face masks. However, even a properly fitted N95 respirator does not completely eliminate the risk of illness or death.

3. When and how should an N95 mask be worn?

A: When the working conditions include harmful exposure to airborne contaminants such as wildfire smoke, employers must provide respiratory protection. N95 masks can reduce the risk of inhaling the fine particles contained in smoke produced by wildfires. These fine particles can harm health. The masks will not protect the user if the mask does not make a tight seal with the user’s face. Facial hair will prevent a tight seal. The mask must be put on correctly. It is always safe to use N95 masks as the most of the cities in the world are being polluted. The indoor, car and office air pollution level determines when to use N95 Masks.

4. How can know the quality of my area ?

Air quality monitors and the air pollution level data of the city can be taken as a reference. For example the air pollution level at Kathmandu can be known from real time monitoring data of or or or US Embassy App safa hawa.

5. What are the differences between N95 Mask and Surgical Mask ?

The  N95 mask has the comfort and convenience features, quality filter, capability to seal the face so that pollution stops. Nosal strip to seal air coming in and out and causing vapors in eyeglasses. Curved low profile design conforms well to nose and eye contours, allowing more room, Innovative Chin Tab designed for ease of positioning, donning & adjustment But the surgical masks has not such properties. Simple surgical masks protect wearers from being splashed in the mouth with body fluids, and prevent transmission of body fluids from the wearer to others, e.g. the patient. It is not air tight so that the it can not protect from pollution due to high leakage of the pollutants form the loose areas.

6. How public need to wear N95 Respirators ?

To work as expected, an N95 respirator requires a proper fit to your face. Generally, to check for proper fit, you should put on your respirator and adjust the straps so that the respirator fits tightly but comfortably to your face. For information on proper fit, refer to the manufacturer’s instructions.

7. What are the general N95 Respirator precautions ?

People with chronic respiratory, cardiac, or other medical conditions that make breathing difficult should check with their healthcare provider before using an N95 respirator because the N95 respirator can make it more difficult for the wearer to breathe. Some models have exhalation valves that can make breathing out easier and help reduce heat build-up.

8. How to Make Sure the Mask Fits ?

A: Do a user seal check, including both positive and negative pressure checks, to verify that you have correctly put on the mask and adjusted it to fit properly.

Negative pressure check

Place both hands completely over the mask and inhale sharply. Be careful not to disturb the position of the mask. The mask should pull into your face. If air leaks around your face or eyes, adjust the nosepiece and straps and repeat the positive pressure check.

Positive pressure check

Put your hands over the mask and breathe out sharply. If your mask has an exhalation valve (like the one pictured above) be sure to cover the exhalation valve when you exhale. No air should leak out of the mask if it fits properly. If air leaks out, re-adjust the nosepiece and straps and repeat the negative pressure check.

9. When to Throw Out the N95 Mask ?

As the N95 mask gets clogged, it becomes more difficult to breathe. When this occurs, throw it out and use a new one. Discard the mask if it is wet or dirty on the inside, if it is deformed, or if the filter is torn. A deformed mask may not fit properly. An N95 mask cannot be cleaned or disinfected.

Frequently Asked Questions for Ozonizers

1. Why should I use the Ozonizer to get rid of the chemicals and germs from the fruits and vegetables? Can’t they be just cleaned under running water?

Ans: No, the harmful chemicals and germs can’t be washed away under running water. The O3 purification technology creates a powerful ozone gas. Every molecule in the ozone gas carries 3 oxygen atoms. When these atoms come in contact with the surface of the fruits and vegetables it neutralises the pesticides and bacteria present on it and also gets rid of other impurities making your fruits and vegetables completely chemical and bacteria free.

2. Does the nutritional value get lost along with the harmful chemicals and germs?

Ans: The purification technology only gets rid of the harmful pesticides and chemicals, retaining the nutritive value of the food.

3. Does the Ozonizer extend the life of the food consumables?

Ans: By removing harmful chemicals and bacteria from the food, the Ozonizer keeps the food items fresh for a longer time.

4. Do you have to participate in the cleansing process of the Ozonizer or does it perform automatically?

Ans:Set the timer function anywhere from 10-30 minutes and the Ozonizer does the purification for you independently.

5. Is the Ozonizer a certified and genuine product ?

Ans:It is CE and ROHS certified product with HS Code. World famous SGS has also tested for bacterial removal test. It is proved effectively it can remove more than 99% of bacteria, virus.

6. Is the Ozonizer designed as a compact space saving device? Does it fit into your modern kitchen as a niche product?

Ans:The Ozonizer is a compact and portable device that can be mounted on the wall or operated anywhere from your place of convenience.

7. Can I re utilize the water in which the food items have been purified in the Ozoniser?

Ans:No, you should not be using the same water for any other purposes. It should strictly it discarded for other use.

8. Which are the different food consumables that can be purified using the Ozoniser?

Ans: Fruits, vegetables, cereals, lentils, meat and seafood can be cleansed and purified using the ozone purification technology.

9. Is the Ozonizer tedious to operate?

Ans:It is very simple to operate the Ozoniser. Just plug the power cord in, immerse the air-stone pipe ( releases Ozone gas) within the bowl containing the foodstuffs immersed in water and set the timer from 10-30 minutes and the purification is carried automatically.

10. Does the Ozonizer require frequent servicing or any replacements?

Ans:No, there is no requirement of replacement of any parts and no servicing required for the Ozonizer

11. Does the Ozonizer get rid of bacteria, chemicals and other Pathogens?

Ans: The high voltage electricity generates ozone to kill harmful bacteria, fungus and other pathogens.

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