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Step 1
Check to make sure that the filters are completely biodegradable. Biodegradable filters are usually made of nontoxic polypropylene which release only carbon dioxide and water as they decompose. And because polypropylene is waterproof, the filter naturally resists contamination from bacteria, viruses, and mold without use of chemical additives or washes.
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Step 2
Look for the Energy Star Seal of Approval as proof that the purifier has been recognized by the United States Environmental Protective Agency as being superior in its energy use because it consumes less energy than other room air purifiers in the same class. Less energy consumption means conserving our natural resources, and makes it less costly to improve your indoor air quality.
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Step 3
Choose a Lifetime Warranty
A lifetime warranty on the purifier is an indication that the purifier is well made and will stand the test of time, and that the manufacturer stands behind its product. This also mhttp://i.ehow.com/images/Contribute2.jpgeans that rather than a disposable purifier that will last only a year or so, you have a product that is reusable indefinitely. This becomes one less product to clog our landfills.
