Temperature Rise Doors - Karpen Steel

Temperature Rise Doors – 250 Degree, 1½ Hour

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 or 650 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.

Top and bottom of doors shall be reinforced with continuous 16-gauge steel channels, spot welded to both sides of doors.
Hinge reinforcements shall be 11-gauge steel angle,
12″ long.
Cylindrical lock reinforcement shall be 16-gauge with 11-gauge thread depth.
Closer and Panic hardware must be thru-bolted.
Edges of door shall be continuously seam welded, ground, and filled to ensure a smooth 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.

Flat 14-gauge astragals are provided with pairs of doors as needed and are shipped loose for field mounting.

Largest single door available: 4-0″ x 8-0″
Largest pair size available: 8-0″ x 8-0″

Temperature Rise Door Detail