| The AHAM seal (usually found on the back of an air cleaner's box)
will list three CADR numbers - one for tobacco smoke, one for pollen and one
for dust. The CADR indicates volume of filtered air delivered by an air
cleaner. The higher the tobacco smoke, pollen and dust numbers, the faster
the unit filters the air.
 Follow
the 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.
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