One of the challenges, if not the challenge in
buying an air filter is that there is no one way to judge
performance. A dozen manufacturers include the AHAM
(Association of Home Appliance Manufacturers) test sticker
and/or logo, which often a measurement
of airflow in cubic-feet per minute. The faster the flow,
the more rapidly room air is cleaned. How well the
air is cleaned is another matter entirely. AHAM advises
buying a unit with a CADR (clean air delivery rate) that is
two-thirds the square foot measurement of the room you
would like cleaned, provided that the ceiling is not
exceedingly high. A 20′ x 10′ room, then, would need a CADR
of about 140. Also, frequently seen on both portable and
whole-house filters and inserts is information from ASHRAE
(American Society of Heating, Refrigeration and
Air-Conditioning Engineers). ASHRAE certification offers a
more informative measure of cleaning, in terms of
“efficiency,” or the percentage of air contaminants
effectively filtered by the appliance.
the more rapidly room air is cleaned. How well the
air is cleaned is another matter entirely. AHAM advises
buying a unit with a CADR (clean air delivery rate) that is
two-thirds the square foot measurement of the room you
would like cleaned, provided that the ceiling is not
exceedingly high. A 20′ x 10′ room, then, would need a CADR
of about 140. Also, frequently seen on both portable and
whole-house filters and inserts is information from ASHRAE
(American Society of Heating, Refrigeration and
Air-Conditioning Engineers). ASHRAE certification offers a
more informative measure of cleaning, in terms of
“efficiency,” or the percentage of air contaminants
effectively filtered by the appliance.
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