What is CADR - Clean Air Delivery Rate

Clean Air Delivery Rate (CADR) indicates the volume of filtered air delivered by an air cleaner.  The CADR ratings are impartial and recognized by the EPA & The American Lung Association

CADR also determines how well an air cleaner reduces pollutants such as tobacco smoke, pollen and dust.  The higher the tobacco smoke, pollen and dust numbers, the faster the unit filters the air.  Using this information, we also calculate the recommend minimum room size for each unit.

Follow our 2/3 Rule:
You'll always want a unit with a tobacco smoke CADR at least 2/3 your room's area. For example, a 10' x 12' room -120 square feet - would require an air cleaner with a tobacco smoke CADR of at least 80. If your room size is smaller, the unit will simply clean the air more often or faster. If you have ceilings higher than 8', you'll want an air cleaner rated for a larger room.  A higher CADR number tells you how quickly the air purifier can filter the air in a certain room.

Source:  www.CADR.org