U . S . ENERGY STAR ® Criteria for Doors
The U . S . standards include criteria for air leakage . Swinging doors cannot exceed 0.5 cfm / ft . Glazing Level U-Factor SHGC
Opaque < or = 0.17 No criteria < or = 1 / 2 Doorlight < or = 0.25 < or = 0.25
> or = 1 / 2 Doorlight < or = 0.30
< or 0.40 for Northern and North-Central Zones
.... < or = 0 . 25 for Southern and South-Central Zones
Climate Zone Map
Northern South-Central
North-Central Southern