This table, ENERGY STAR Qualification Criteria for Residential Doors, provides the qualification criteria for each glazing level. Glazing level refers to the amount of glass in the door. An opaque door has no glass. A door that is less than or equal to half-lite is comprised of approximately half glass or less. A door that is greater than half-lite is mostly glass; this category includes fully glazed or full-lite doors such as sliding glass doors. ENERGY STAR criteria use U-factor (measured in British thermal units over hours times square-feet times degrees Fahrenheit) and Solar Heat Gain Coefficient (or SHGC, a fraction of incident solar radiation) ratings. The qualification criteria for doors are as follows: Opaque doors must have a U-factor of 0.21 or less and there is not requirement for SHGC. Less than or equal to half-lite doors must have a U-factor of 0.27 or less and an SHGC of 0.30 or less. Greater than half-lite doors must have a U-factor of 0.32 or less and an SHGC of 0.30 or less.

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