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• A buildup of .042 inches of dirt on a heating or cooling coil can result in a decrease in efficiency of 21%. (EPA—Environmental Protection Agency)



• Indoor air is found to be 70 times more polluted than outdoor air.



• Most commercially purchased fiberglass filters are only 7% efficient in stopping dirt, dust, pollen, etc., passing through it. (ASHRAE)



• 50% of all illnesses are either caused or aggravated by polluted indoor air. (American College of Allergists)



• One out of six people who suffer from allergies do so because of the direct relationship to the fungi and bacteria in air duct systems. (Total Health Magazine)



• Legionnaire's Disease was spawned in air-conditioning ducts. It killed 29 people in 1976. (American Lung Association)



• Children are more likely than adults to be affected by polluted indoor air. They breathe faster, inhale more air per unit of body weight, and are closer to the ground where concentrations are higher. (Dept. of Consumer Affairs)



• The elderly, asthmatics, and people with breathing problems, allergies, and lung diseases are also likely to be more sensitive to pollutants. (Dept. of Consumer Affairs)