biological contaminants
September 11, 2010
Filters (furnace air conditioner, heat recovery ventilators)
May be loaded with dust
September 11, 2010
Humidifier trays (also dehumidifiers, air conditioners, refrigerators, laundry equipment)
Standing water supports micro-organisms
September 11, 2010
Attics
Moisture and mold problems from house air leakage into the attic space；also animal droppings
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