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Temperature Rise Doors

A temperature rise door is used when it is required to retard the transmission of heat from one area to another. It is a measurement of the rise in temperature above ambient temperature of the non-exposed side of the door during the first 30 minutes of the standard fire test. The lower the degrees, the better the rating. The currently accepted norm is a 250 degree rise over 30 minutes. A temperature rise rating is not required for a standard labeled fire door.

The 250 degree temperature rise designation is the most stringent rating since it requires the most limiting rise in temperature. A 250 degree temperature rise door meets the requirements of specifications calling for a 450 degree temperature rise rating.

Temperature rise doors are generally used in stairwells of high-rise buildings. The doors are used to limit the temperature rise through the door into the stairwell for a period of time, thus making it possible for people to exit the burning building by safely passing by the floor of the origin of the fire.



Material -16 or 14-gauge sheets of commercial grade A60 Galvannealed.

Core -Steel Stiffened


Top and bottom of doors shall have continuous 16-gauge steel channels, spot welded to both sides of doors.

Hinge reinforcements shall be 7-gauge steel, 12" long.

Cylindrical lock reinforcement shall be 16-gauge.

Closer and Panic hardware must be thru-bolted.

Edges of door shall be continuously seam welded, ground, and filled to ensure a smooth finish.

Hinge Backset - 1/4" standard. 3/16" or 1/8" available.

Finish - Doors shall be thoroughly cleaned after assembly and given a prime coat of rust inhibiting paint. The primer shall be air dried. Low gloss oil base trim paints (max gloss 25) are recommended as a finish paint.

Undercut - 3/4" standard. Other undercuts as specified.

Astragals - Flat 12-gauge astragals are provided with pairs of doors as needed and are shipped loose for field mounting.

Size Limitations

Largest single door available: 4-0" x 8-0"

Largest pair size available: 8-0" x 8-0"

Vision Light

Up to 100 square inches exposed.