"Thank you for the way you handled every detail of this project from our introduction to your firm and its products, through the bidding process, to the day of completion. In our view you went above a... » more
- Robert H. Lay of Davenport, Iowa


» More Testimonials

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.

Not quite sure what the proper home improvement terms are? Let us help. We have put together a glossory for you to learn a little bit more about Home Improvement Glossary and Terms

For furthur reading please see our Learn the Basics Homepage.