Fire Rated Metal Doors

Commercial Hollow Metal Doors


Fire Rated Metal Doors 

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Our temperature-rise metal doors are designed to delay and limit heat transfer generated from a fire. The cores demonstrate superior performance in protecting the areas that are not yet exposed to the fire by slowing the transmission of heat. These heat-retardant capabilities allow for safe evacuation during a fire. In accordance to temperature rise standards, the unexposed door surface will reach a maximum temperature of 250°F during the initial 30 minutes of a fire and 450°F after 60 minutes. Our standard fire rated metal doors are 1 ¾” thick and are available in 16, 18, and 20 gauge galvannealed steel.

General Specifications: Door faces are flush and free of any joints, welds or seams. Longitudinal door edges are interlocked with mechanical seam and reinforced with epoxy adhesive (seamless edge optional). Door edges are beveled 1/8” (3 mm) in 2” (50 mm). Door hinge reinforcements are prepared for standard weight 41⁄2” x 41⁄2” (114 mm x 114 mm) hinges which can easily be converted to accommodate heavy weight hinges.

Direct Doors use fire labeled doors approved by both Intertek Testing Services (ITS Warnock Hersey) and Underwriters Laboratories (UL) Fire Labeling Programs. Doors can be fire labeled for up to 3 hours and must be installed in an equivalent fire labeled frame with approved fire listed hardware.

Fire Door Classified Openings

The location of fire-door openings in a structure determines their classification. These classifications are established by the length of exposure protection necessary for the potential fire hazard of the area. There are also restrictions on the amount of glass that is permitted to be in a fire-door opening. Please call us for additional information on allowable maximum glass. Listed below are the six opening classifications.


Door Rating

Description and Use


3 Hour (180 Minutes)

Openings separate buildings or divide a building into multiple fire areas


1 1/2 Hour (90 Minutes)

Stairwells, elevator shafts, and other vertical/exit areas


3/4 Hour (45 Minutes)

Openings into corridors or room partitions


1 1/2 Hour (90 Minutes)

Areas of potential severe fire exposure from the exterior


3/4 Hour (45 Minutes)

Areas of potential moderate fire exposure from the exterior


1/3 Hour (20 Minutes)

Areas where smoke and draft control is required



  • Five Basic Requirements for a Fire Rated Opening 

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