The maximum size available for 45-minute rated fire doors is 3′ 6″ x 8′ 0″ for single doors, and 7′ 0″ x 8′ 0″ for double doors. Doors with glass are available, with the total glass size no more than 1,248 square inches. Fire-rated wood jambs are available on single doors only, with jambs at least 4-9/16″ wide. Steel fire-rated jambs are required for double doors. Mortised flush bolts are allowed. Mortised automatic door bottoms are not available on 45-minute rated fire doors.
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