These procedures apply to fire door frame assemblies which have demonstrated fire-resistive properties in fire tests sufficient to warrant their use with fire doors having a rating of 20 minutes up to and including 3 hours when tested in accordance with NFPA 252, Standard Methods of Fire Tests of Door Assemblies, UL 10B Fire Tests of Door Assemblies, UL 10C Positive Pressure Tests of Door Assemblies, and CAN/ULC S104 Standard Method for Fire Tests of Door Assemblies. The frames may include provision for transoms, mullions, or sidelights.
