History
In the early 1980s, AHAM developed a method for measuring the clean air delivery rate for portable household electric room air cleaners. The resulting standard became an American National Standard in 1988 and was last revised in 2006. Known as ANSI/AHAM AC-1, it measures the air cleaner's ability to reduce tobacco smoke, dust and pollen particles in a room. It also includes a method for calculating the suggested room size.
Read more about this topic: Clean-air Delivery Rate
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“Every generation rewrites the past. In easy times history is more or less of an ornamental art, but in times of danger we are driven to the written record by a pressing need to find answers to the riddles of today.... In times of change and danger when there is a quicksand of fear under men’s reasoning, a sense of continuity with generations gone before can stretch like a lifeline across the scary present and get us past that idiot delusion of the exceptional Now that blocks good thinking.”
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“These anyway might think it was important
That human history should not be shortened.”
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