A furnace filter is a filter that protect the furnace. It also contributes to good health and well-being by cleaning the air circulating through the house. Furnace filter designs and rating systems vary. Some of the filters remove large, heavy particles from the air but allow smaller particles to flow through. Large particles include lint, pollen, and mold spores while medium particles include dust, animal dander, and bacteria. The smallest particles (0.3 microns and below) include smoke, smog, and viruses. By comparison, a human hair is between 3 to 200 microns. For more information please visit the website
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