Maryland Association of Home Inspectors
Due to central air conditioning and the lack of window ventilation, the fumes and contaminates from people, pets, heating, cooking, cleaning and bathroom use are now trapped indoors. Kitchen and bathroom exhaust fans and clothes dryers remove indoor air and create significant minus air pressure indoors. Make-up air is forced to flow indoors through walls, attics, crawlspaces, basements and down chimneys and combustion exhaust vents. Airborne bacteria and viruses, perspiration, mold, radon, combustion exhaust, dust, dirt, lead dust, asbestos and chemicals from paints, finishes, treated insulation and building materials and furnishings are retained or are drawn into the house. IAQ becomes unsanitary and unhealthy, and indoor oxygen depletion affects occupants and combustion equipment and appliances. Learn to identify damaging, unhealthy or hazardous conditions existing in minus pressure houses.
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