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Selecting an air cleaner can become confusing because of the wide range of air cleaners available today. Many claims are misleading or just advertising hype. The only official measure of an air cleaner’s efficiency is the Dust Spot Test Rating. This measure is endorsed by the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE). Other tests and efficiencies are simply not an "apples to apples" comparison. Look for a Dust Spot Test Rating of 25% or higher when considering an air filter. The Department of Health, Education and Welfare recommends this as the minimal level for an air cleaner to be truly effective. ·
What Causes Indoor Air Pollution? |