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Important Air Quality Guidelines

True HEPA Filter

How Air Purification Works

It is important to note the differences between a True HEPA Filter and a HEPA-type or HEPA-like Filter when shopping for air purifiers. In order to be rated as a True HEPA filter, a filter must pass the Dioctyl Phthalate Aerosol test and it must exceed a minimum efficiency of 99.97% at a particle size of 0.3 microns with less than a one inch drop of air pressure. HEPA-type and HEPA-like filters, while lower in cost, are much less efficient than True HEPA filters, especially at particle sizes less than 1 micron. Removing particles that are less than 1 micron in size is important as these particles can enter into the blood stream and contribute to illness and/or disease.


CADR Chart

Fellowes® Air Purifiers have been certified by the Association of Home Appliance Manufacturers (AHAM) with three Clean Air Delivery Rate (CADR) numbers which indicate the volume of filtered air delivered by the air purifiers (measured in ft3/min). There are three CADR ratings - one for smoke, one for pollen and one for dust. The higher the number, the faster the air purifier filters the air.

Energy Star

Energy Star

Fellowes® Air Purifiers are also Energy Star-qualified. Energy Star-qualified air purifiers are 40% more energy-efficient than non-qualifying models.



Fellowes® air purifier carbon filters are protected with Sanitized® Technology, which effectively reduces the development of bacteria, fungi, and dust mites on the carbon filter itself. This is important because, without this technology, microbes can settle on the filter and be re-circulated into the air.