Blueair’s HEPASilent™ technology is what makes Blueair air purifiers almost silent. In this technology, pioneered by Blueair, electrostatic filtration first makes airborne particles easier to trap by giving them a negative electrical charge. This negative charge makes the particles adhere to the polypropylene fibers in the filter more easily, which allows the use of a less dense filter, so more air can be pushed through with less noise and less energy.

It is common to see higher levels of tVOCs in bedrooms or generally in any room with human presence. The reason is that the human body produces different gasses and VOCs, such as nitrogen, hydrogen, carbon dioxide, oxygen, and methane. Those "human-made" gases cannot all be removed by air purifiers. Simply ventilate the room regularly to let in fresh air and remove those gasses.

The Pure Fan Auto has a particle sensor which monitors the air quality in your room. Selecting the Auto Mode means that your Pure Fan Auto will automatically adjust when pollution levels creep up. The fan increases to the right speed based on the sensor readings and slows down when the air is clean again. This ensures that your air purifier is always running at the perfect speed needed to maintain the purity of the air in your home.​

The Blue Pure Fan does not have the Auto Mode. Only the Pure Fan Auto has the Auto Mode.

The indoor air quality thresholds are based on several regulatory values recommended by the United States Environment Protection Agency (US EPA) and the World Health Organization (WHO). For outdoor ambient air, the Blueair Friend app uses the thresholds from the US EPA Air Quality Index (AQI).

HEPA grades a filter’s filtration efficiency grade following American and European HEPA Standards:

American HEPA: The American standard requests a filter media to have at least 99.97% efficiency at 0.3 micron to be classified as a HEPA filter.

European Standards: In Europe, there is a numerical grading system from H10 – H14 depending on the filter’s filtration efficiency.

HEPASilent and HEPASilent Ultra are Blueair’s unique air filtration technology that uses a combination of mechanical and electrostatic filtration to capture and remove particles from the indoor air. Blueair HEPASilent™ technology removes 99.97% of airborne particles down to 0.1 microns in size. Our HEPASilent™ technology is unique in that it uses the mechanical filtration to draw in polluted air into the air purifier, then electrostatically charges particles to allow particles to better cling to the filter media in the unit, which in turn increases the air purifier’s filtration efficiency and overall performance.

HEPA grades a filter’s filtration efficiency grade following American and European HEPA Standards:.

-American HEPA: The American standard requests a filter media to have at least 99.97% efficiency at 0.3 micron to be classified as a HEPA filter.

-European Standards: In Europe, there is a numerical grading system from H10 – H14 depending on the filter’s filtration efficiency.

H13 HEPA is based on the European numerical grading system. H13 indicates the filter has 99.95% filtration efficiency.

Particles, bacteria and viruses

Blueair air purifiers are designed to remove both ultra-fine and coarser particle pollutants from the air. Most particle pollutants are natural or come from the incomplete burning of fossil fuels. The most common natural pollutants are dust, pollen, mold, pet allergens, viruses and bacteria. The pollutants from incomplete burning of fossil fuels come from vehicle motors, industrial processes and power plants.

Follow the links below to learn more about the benefits of Blueair air purifiers with specific pollutants.

Air purifiers for pet allergens.

Air purifiers for dust mites.

Air purifiers for mold.

Air purifiers for pollen.

Optimizing the air for your baby.

Volatile Organic Compounds (VOCs)

VOCs are gaseous organic chemicals found in both outdoor and indoor air. “Volatile” means that a compound easily evaporates at normal temperatures and pressures. VOC sources are widely used as ingredients in household products. Paints, varnishes and wax all contain organic solvents, as do many cleanings, disinfecting, cosmetic, degreasing and hobby products. The irritating gases may play a role in many illnesses, from respiratory disease to chemical sensitivity.

A quick reduction of gaseous pollutants is best achieved by the filters with activated carbon, such as SmokeStop™, DualProtection, MultiSmokeStop and the Particle and Carbon filters.

Check the following topics to learn more about the effects of Blueair air purifiers against smoke and VOCs.

Air purifiers for tobacco smoke.

Air purifiers for VOCs, odors and gases.

There is no such thing as a “medical grade” HEPA filter. In the US, the FDA does not grant approval or certification for a “medical grade” HEPA filter. Buyers should be aware that there is a lot of miscommunication and lack of enforcement in the air purifier market regarding these false claims.

True HEPA is defined as a filter media with at least a 99.97% efficiency at 0.3 [OL1] micron. Through a combination of mechanical and electrostatic filtration, Blueair’s HEPASilent has been independently tested to show a 99.99% filtration efficiency at 0.3 micron, meeting the HEPA definition.

The higher the CADR(Clean Air Delivery Rate) test numbers, the better the unit’s overall ability to clean indoor air. For example, if an air purifier has a CADR of 388 for tobacco smoke particles, it will reduce smoke particle levels to the same concentration as would be achieved by adding 380 cubic feet of 100% clean air per minute.

• according to the recommended room size.
• where you spend most of the time (bedroom/living room)
• where the air can circulate freely: at least 10 cm (4 inches) away from any potential obstacles.

When selecting the Night Mode on your unit, the fan will run at the lowest fan speed and the LED lights will dim down.​ Check your unit's user manual to see if Night Mode is available.

We recommend using the Night Mode when you want to ensure a good air quality, with a minimum of disturbance.

• Vacuum the outside of the air purifier regularly, especially the air inlets and outlets.
• Clean the pre-filters according to the instructions in the user manual (not all models have a pre-filters).
• Vacuum the inlet of the air quality sensor (not all models have an air quality sensor).
• When the filter change warning appears on the air purifier and in the app, replace the filter with a new Blueair filter.

Always refer to the user manual for instructions to a specific model.

If you have an issue with your product, please contact your local Blueair retailer from which you purchased the item. To contact Blueair for personalized support, please visit www.blueair.com and click on Support to access all the ways to contact the closest Customer Support team.

It is not recommended to clean the filters in any way. Vacuuming or washing filters with water could damage the filter media and decrease the performance.