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BackAir Infiltration Through Cracks and Around Windows
| Type of Window | Cubic Feet per Hour per Foot of Crack |
|---|---|
| Around frame in masonry wall, not caulked | 8 |
| Around frame in masonry wall, caulked | 2 |
| Around frame in wood-frame construction | 6 |
| Total for Average window, non-weather-stripped, 1/16-inch crack and 3/64-inch clearance. Includes wood-frame leakage | 21 |
| Weather-stripped | 13 |
| Total for poorly fitted window, non-weatherstripped, 3/32-inch crack and 3/32-inch clearance. Includes wood-frame leakage | 69 |
| Weather-stripped | 19 |