What is an Air Leakage (AL) rate?

What is an Air Leakage (AL) rate?

An air leakage rate is a measure of how much air leaks through the crack between the window sash and frame. The rating reflects the leakage from the window exposed to a 25 mph wind and measured in cubic feet per minute per linear foot of sash crack. The lower the rate, the less air that passes through the crack in the window assembly, and an air leakage rating of 0.30 or less is recommended.

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