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Classic support

All the topics, resources and guides you need for your Classic air purifier.


This is the expected behavior if the air is clean, so be reassured that the purifier is doing a good job!

How to check that the sensor is reacting correctly?

  • Turn the fan off and apply some dust close to the sensor (by shaking dusty cloth next to the unit). You should see a peak in PM values after this action.
  • If nothing happens, try vacuum cleaning the sensor module filter and test again.
  • If you need any help, do not hesitate to contact the place where you bought the unit or Blueair directly.

Make sure that you have removed the plastic cover from the filter (not applicable to all models and filters).

Make sure that nothing blocks the air inlet and outlet.

Make sure that no object or dust is clogged around the filter. If there is, remove the filter and clean the purifier with a vacuum cleaner.

To remove the filter(s) to see if it is causing the noise:

  • Turn off your air purifier and unplug it.
  • Remove the filter(s).
  • Plug in the unit and turn it on. If the noise disappears, install a new filter. If the noise is still there, please contact the retailer where you bought the air purifier. They will help you according to their warranty conditions.

Your device has lost its Wi-Fi connection temporarily.

If you haven’t changed any the Wi-Fi settings on your router, the device should be able to reconnect by itself within a few minutes.

If necessary, try the following troubleshooting tips to reconnect the device:

  • If you changed a Wi-Fi setting on your router, you must update your app with these settings. Tap ‘+’ in the top right corner of the app and re-add your device.
  • Unplug and plug the router.
  • Make sure that VPN is off and that you are not using Firewalls (for more information about, check below the Wi-Fi network requirements: 'What Wi-Fi does Blueair smart products support?').
  • Place the device closer to the router.
  • Check to see if the Wi-Fi is busy with other devices.

What Wi-Fi does your Blueair product support?

2.4 GHz standard Wi-Fi access point (b, g or n).

All standard signal encryptions: WEP, WPA, WPA2, TKIP, AES.

Un-encrypted wireless connections (i.e. Open) Please note: Professional versions of the protocols which require a certificate are not supported. This can be the case for company networks.

Captive portals are not supported. This is when you need to enter a username and password to access internet, such as in airports or public places.

An access point that broadcasts multiple SSIDs networks or on multiple channels simultaneously may create problems of data packets being lost. This is especially the case in pairing products to the app.

Make sure that no firewall blocks outgoing connections (blocking inbound connections is OK) or any restrictions on protocols such as http/https or sockets.

If your air purifier is connected to wi-fi, you can control the light on your device in the app. For more information, please see the User Manual in our Customer Support section.

First few times you use your air purifier

As with any new device, an air purifier can release a ’newness’ smell. Don't worry, this odor is not dangerous or toxic! Run your air purifier non-stop for a few days and the odor should dissipate.

For optimal use, keep the air purifier on at all times. It uses less energy than a low-energy light bulb.

Time to change the filter?

A dirty filter can release a dusty smell. Filters absorb odors from, for example, cooking. To avoid this, always replace the filter when indicated.

The sensors measure

  • the concentration of Particulate Matters (PM2,5) in the air
  • the concentration of Volatile Organic Compounds (VOCs) in the air
  • the air temperature
  • the humidity in the air

Particulate Matters (PM2.5)

PM2.5 are air pollutants with a diameter of 2.5 microns (micrometers or µm) or less. They are also known as ‘fine particulate matter'. Common PM2.5 sources are car traffic, industrial plants, metal processing, cleaning fluids, beauty products, candles, cooking and smoking.

Volatile Organic Compounds (VOCs)

VOCs are different organic chemicals, that are emitted as gases from certain solids or liquids. They include both human-made and natural chemical compounds. A total VOC (tVOC) sensor detects such gases and summarizes them into one level. No individual gas is tracked. Both harmful and harmless VOCs are detected.

Examples of families of substances that the VOC sensor detects:

  • Aldehydes (formaldehyde, acetaldehyde, acrolein).
  • Hydrocarbons (toluene, benzene, undecane, xylene, naphthalene, butane, styrene, ethylbenzene, propane, kerosene).
  • Amines (ammonia derivatives), alcohols (ethanol etc), ketones (acetone, methylethylketone (MEK), butanone, butanedione).
  • Esters (butyl acetate).
  • Carbon monoxide, hydrogen, acrylamide, organic acids.

Common VOCs sources are building materials (paint and varnish), furniture, printers, cleaning products, air fresheners, laundry detergent, glue, paint, perfume, repellent, scented candles etc.

People and animals also release VOCs when they breathe, perspire or digest. These VOCs are not dangerous for humans if the room is properly ventilated. The Blueair filters are not designed to remove these VOCs. You easily get rid of them if you open the windows every day for 5-10 minutes.

A high tVOC value may result from a high level from one single compound or it may be a collection of low compound levels from a chemical ‘mix’. Our filters remove most of the VOCs that the sensors detect, but not all of them. If you get high VOCs that don't go down with ventilation, investigate the potential source of pollution. Check your app to spot the moment when the VOCs started to increase. Then try to relate it to an event that occurred at that time (new furniture, use of a fireplace, cooking, big cleaning)? If you need help to understand the values, please contact the place where you bought the unit or Blueair directly.

Air temperature and humidity

The sensors detect water stagnation, water damages, humid surfaces and warm environments. These factors can encourage the growth of mold, bacteria and allergens, such as house dust mites. The common recommendation of humidity is between 30-65%. VOCs tend to evaporate more with a higher temperature.

If you are using an air purifier with sensors, you have the option to set the purifier on auto mode, via the app or on the unit directly, to trigger the airflow speeds automatically according to pollution levels.

If your air purifier automatically runs on the highest speed level, it means that the concentration of VOCs and/or particles in the room have increased and requires faster air cleaning. You can choose via the app if you want the auto mode to trigger on particle levels or particle and gas levels (Tap the information details (‘i’)).

Your air purifier should gradually lower the airflow speed as soon as the air in the room is clean again.

What does it mean if the air purifier continues running on high speed?

Most of the time, it means that some dust is clogged on the filter or on the sensors. Here is what you can do:

  • Make sure you have replaced the filter in the last 6 months.
  • Make sure that the auto mode settings in the app are adapted to your type of filter (if you are using a Particle filter, the auto mode trigger in the app should be set to ‘Particles’ only. If you are using a carbon filter, the auto mode trigger should be set on both ‘Particles' and 'Gases’).
  • Check that no dust or any item is blocking the inlet and outlet grids of the air purifier. Vacuum the air purifier from the outside. Don’t forget to vacuum where the sensors are located. The sensors are two circular arrays of holes on the side or at the bottom of the unit.
  • Open a window and air out the room. If high levels of VOC (gases) are causing the full speed, the room might be filled with a gas which cannot be removed by the air purifier (tVOC sensors can sense thousands of different gases, including harmless ones which cannot all be removed by the air purifiers).
  • If auto mode and child lock are activated, deactivate them from the app. Try to change the fan speed from the app or manually.
  • If you are using an air purifier from E-series (models 270E, 450E, 550E, 650E etc.).
  • Use a can of compressed air (like the one you use for keyboards) to clean the sensor area. From the outside, give the sensor area a couple of 3 seconds blasts.
  • The sensors are two circular arrays of holes on the side of the LED display, one will be arranged like a flower; the other, a circle.
  • If cleaning the sensor area doesn't help, reset the software on your air purifier. This resets the filter timer and the sensor: link to how to reset the E-series settings.

If you need any help, do not hesitate to contact the place where you bought the unit or Blueair directly.

Blueair filters cannot be cleaned or washed. They need to be replaced every 6 months. Please check your user manual to see replacement indications for your model. All user manuals can be found in our Customer Support section.

Blueair pre-filters can be vacuumed or cleaned with your laundry (30 or 40 degrees maximum). The pre-filter is the colored textile filter that you place on the outside of your unit (only available for the Blue Pure series).

Products without sensors can be moved between different rooms or locations.

You can move also products with sensors, but keep in mind that air quality readings will be less accurate at the beginning in the new location. The high-tech sensors calibrate automatically over time, learning to read the room. So the readings become more and more accurate the longer the sensors stay in one place.

For continuous and efficient air cleaning and air monitoring, our recommendation is to leave the air purifier on 24/7 in the room where you want to clean the air.

Note: After the learning period, when you plug in again the Aware air monitor to an electrical outlet, it takes around three hours before it shows relevant values.

If you change the location of your Aware to an area with a different Wi-Fi network, you must re-do the pairing of the product with the app. Select ‘+’ in the app and follow the instructions.


1. Unplug the Blueair Classic unit and plug it back again.

2. Set the unit to manual mode:

a. Open the flip top lid and press the Wi-Fi symbol on the display for three seconds.

b. Wait until the Wi-Fi symbol is blinking and press it again for three seconds.

When the Wi-Fi symbol is pulsing, the Blueair Classic is in manual mode.

3. On your smartphone, navigate to 'Wi-Fi settings'. Wait for the network 'classic-config' to show. Connect to it.

4. Return to the Blueair Friend app and follow the guided process.

5. When the app asks you to connect your Blueair Classic to a Wi-Fi network, fill in the name and password of the Wi-Fi network that you want to connect your Blueair Classic to.

When the LED light is solid, your Blueair Classic is connected to your Wi-Fi network. The temporary Blueair classic-config network is automatically terminated. Your smartphone automatically connects to your usual Wi-Fi network.


As our particulate matters (PM) sensors are very sensitive, high PM values can appear for many reasons: use of candles, smoke, cooking, incense, fireplace, smoking, cumulated dust, unfiltered vacuum cleaner, pollen, pets, etc. PM peaks are very common and normal, as long as they lower when the purifier is running.

In case of high PM2.5, we recommend you to set the highest speed of your air purifier temporarily and to ventilate the room.

If your PM values do not lower even after running your air purifier and ventilating, the reason for high PM might be that there is dust on the PM sensor.

After a big cleaning in your home or after unpacking your air purifier, some dust might have gotten stuck on the sensors, showing high PM values even though the air is pure.

You can get rid of potential dust on the sensors by simply vacuum cleaning the unit from the outside regularly. The sensors on air purifiers are located on the side of the unit or at the bottom, depending on the model. They are displayed by two arrays of holes.

The PM sensor of the Aware air quality monitor is located at the top of the device.

We recommend replacing the filters every 6 months approximately for best efficiency. Your unit will indicate you when it is time to change.

If you still think that your values are too high, contact us. We'll help you check that your device is used correctly.

Classic user manuals


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