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Air leakage rating (windows and doors)
Air leakage rating measures how much air can pass through a window or door assembly.
Why it matters
Air leaks create drafts and noise and raise energy costs.
Where people get this wrong
A good air leakage rating can be ruined by a bad install. Weatherstripping and adjustment affect air leakage for doors.
Real-world example
You feel a cold stream near the latch side of a door on windy days. That is air leakage you can feel without any tools.
Where this hits your build
This comes up during selections and installation. Performance depends on the product and the install. A good window installed poorly still leaks.
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