"We want to thank Suburban Construction for commendable service. More than nine years ago, we had Suburban replace all the windows in our home with replacement windows, insulated with low e Argon gas.... » more
- Don and Mary Schaefer Bettendorf, 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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