"Dear Team Members, My wife and my self would like to thank you for the super service that we have gotten from you on a couple of occasions. The siding and windows were done just the way we wanted and... » more
- Jim and Mary Jones Davenport, Iowa


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Air-Leakage Rating

A measure of the rate of air-leakage around a window, door, or skylight in the presence of a specific pressure difference. It is expressed in units of cubic feet per minute per square foot of frame area (cfm/sq ft). Formerly expressed as cubic feet per minute per foot of window perimeter length (cfm/ft) but not now in use. The lower a window's air-leakage rating, the better its air tightness.

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