fireframes

Fireframes is a term used in fire protection engineering to describe the frame assemblies that surround and support fire-rated openings in walls and partitions. They are designed to maintain the integrity of a compartment boundary during exposure to fire and to support doors, glazing, and hardware that are rated for specified fire durations. In practice, fireframes are part of passive fire protection and are selected to match the fire-resistance ratings of the surrounding wall.

Fireframes may be constructed from steel, aluminum, timber, or composite materials, depending on the performance requirements and architectural constraints. They are designed to minimize deformation under heat, accommodate thermal expansion, and retain alignment of doors and glazing throughout the test period. Where glazing is used, the frame accepts fire-rated glass and is paired with intumescent seals or gaskets to limit heat and smoke transfer.

Performance is validated through standardized fire-resistance tests in which the entire door and frame assembly is evaluated within a representative wall construction. Ratings commonly range from 30 to 120 minutes, depending on regional codes. Installation must follow manufacturers' specifications and be properly sealed to prevent bypass of the rating; field modifications typically require re-testing.

Applications include openings in smoke barriers, corridors, and other fire-resistance rated partitions, as well as elevator enclosures and storefronts in high-risk facilities. Limitations include the dependence of the overall assembly rating on the weakest component and on correct installation. Regular inspection and maintenance are recommended to preserve performance.

See also: fire door, passive fire protection, compartmentation, fire-rated glazing.