Fire Rated Door Threshold Detail

Bs9999 2008 recommends for fire doors with cold smoke control that the threshold gap should be either less than 3mm in height or should be fitted with a threshold seal.

Fire rated door threshold detail. Standard steel doors can be provided with a variety of louver designs and sizes. Our facility undergoes routine inspections to verify that modifications are. Trudoor is an authorized whi fire labeled shop warnock hersey intertek enabling us to modify re certify and label fire rated doors and frames. 111 c recommended louver details for standard steel doors.

For example nfpa 101 currently requires smoke leakage rated assemblies for new fire doors serving an area of refuge and requires compliance with nfpa 105 for new door assemblies in three locations. Vestibules that are part of a smokeproof enclosure horizontal exits and elevator lobby doors in occupant evacuation elevator shaft systems. Metal fire doors can attain ratings up to 3 hours where wood fire doors can be rated up to 90 minutes. When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible.

Per nfpa 80 the combustible flooring the subfloor and the surface cannot extend through the opening so a noncombustible sill is required. The construction at the fire door is tricky especially when the fire walls are type v construction using a u300 or u400 series fire wall assembly. I treat the threshold as part of the sill assembly. And we are certified by ul to cut re certify and label fire rated glazing materials.

Product overview fire rated steel doors for commercial industrial applications.