Healthy AirEducation

Building Envelope

The building envelope refers to all external building materials, window and walls that enclose the internal living space. Homes are built tighter to control air leakage and improve energy use, but tighter construction limits much-needed air exchanges. If the envelope isn't constructed of "breathable" materials, stale air and pollutants tend to be retained and re-circulated via the HVAC duct system.
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