Description

This standard establishes requirements for testing the fire resistance of swinging, sliding, and rolling door assemblies under neutral or negative pressure.

The standard evaluates a door’s ability to remain in its opening while resisting fire and a hose stream, simulating performance in fire-rated wall assemblies.  

Scope

Test Procedure: Specimens are subjected to high-temperature furnace exposure—reaching over 1000^oF — for set durations (20 min to 4 hours).

Hose Stream Test: After the fire test, the door is immediately exposed to a pressurized water stream (30–120 psi) to measure structural integrity against thermal shock.

Application: Used for fire doors, frames, and hardware in locations where fire resistance ratings are required by building codes.

Neutral Pressure: Unlike UL 10C (positive pressure), UL 10B tests under "neutral" conditions, often used for specific legacy installations or certain door types.

Scope: Covers various materials used for doors, including steel, hollow metal, and fire-rated wood cores.