Air leakage on a window label shows how much air can pass through the window during testing. Lower ratings usually mean fewer drafts and better comfort.
Window Performance Labels
What Does Air Leakage on a Window Label Mean?
Air leakage reflects how much air can pass through the assembled window under testing conditions.
For homeowners, a lower air leakage rating usually means fewer drafts and better real-world comfort, assuming the installer also seals the opening correctly.
Why It Matters
- Lower air leakage can help reduce drafts.
- Better sealing can improve indoor comfort.
- Installation quality still matters.
- The window and the opening both need to be properly sealed.
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