Fire Door Threshold Detail

180 thickness latches locks.
Fire door threshold detail. All fire rated doors must include an automatic latching mechanism. 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. Doors over 4 0 wide and 8 0 tall must use heavyweight hinges.
When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible. Protection association for fire doors and fire windows nfpa 80 and the door components installation instructions. These doors must stay closed in the event of a fire. 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.
These all show sills positioned at floor level ie not rebated. Door clearances at the door edge of the door frame wood door on the pull side of the door do not exceed clearances listed in 4 8 4 the clearance under the bottom of the door shall be a maximum of 3 4 and 6 3 1 top edges 1 8 metal door top edges up to 3 16. 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. Floor levels versus threshold levels.