Air purifying
air purifier
This is what we use on individual rooms in a house as opposed to in a very large teaching area (36 x 48 = 1728 sq ft; a
typical school would be 48 x 55 overall with discrete spaces for lockers, office, bathrooms, kitchen ...)
The device above is a Medify Air MA-14-W. It has an H13 HEPA filter, which is an upgrade on a so-called 'true' HEPA: 
both are supposed to remove particles 10 microns or larger of pollen, dust, mold, bacteria, dustmites, common smoke (a
concern these days in California), lead dust and pet dander. H13 also is supposed to filter smaller particles of asbestos,
insecticide, tobacco smoke and so on down to particles 0.1 microns in size. This device has a CADR of 120 which means it
should clean the air in a 200 square foot room in 30 minutes and the air in a 470 square foot room in 60 minutes.
The device was about $100 and the replacement air filter is about $40.
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