Fire Door Threshold Detail

Protection association for fire doors and fire windows nfpa 80 and the door components installation instructions.

Fire door threshold detail.

When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible. 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. The ul 1784 test standard states in order to obtain information on the extent of air leakage at the ungasketed bottom gap of a test sample an artificial seal may be applied to the bottom 6 inches 152 4 mm of the test sample. Thresholds are rarely mandated by the codes and standards for fire doors or smoke doors but when they are used in these applications thresholds must be listed to ul 10c or nfpa 252.

Terminology used in describing these frames follows as closely as possible the american national standard for nomenclature for steel doors and steel door frames ansi a250 7. 180 thickness latches locks. These all show sills positioned at floor level ie not rebated. These doors must stay closed in the event of a fire.

All fire rated doors must include an automatic latching mechanism. Doors up to 4 0 wide and 8 0 tall can use standard weight 134 thickness ball bearing hinges. Backbend return face stop soffit rabbet throat. E2 as1 includes general door sill details figures 17c and 17d and specific door sill details for masonry veneer figure 73d.