防火門是指在一定時間內能滿足耐火穩定性、完整性和隔熱性要求的門。它是設在防火分區間、疏散樓梯間、垂直豎井等具有一定耐火性的防火分隔物。由門框、門扇及五金配件等組成，具有一定耐火性能的門組件。所述的門組件中，還可以包括門框上面的亮窗、門扇中的視窗以及各種防火密封件等輔助材料。[來源：國準GB/T 5907.5-2015,2.14.1.1]pedestrian doorset or industrial type doorset including any frame or guide, door leaf or leaves, rolling or folding curtain, etc., which is provided to give a fire resisting capability when used for the closing of permanent openings in fire resisting separating elements, which includes any side panel(s), flush over panel(s), transom panel(s) and/or glazing together with the building hardware and any seals (whether provided for the purpose of fire resistance or smoke control or for other purposes such as draught or acoustics) which form the assembly.[來源：歐標BS EN 1634-1:2014,3.1]doorset which, as installed in a building, is intended when closed to resist the passage of fire and is capable of meeting specified performance criteria.[來源：英標BS 4422:2005, 3.325]Any combination of a fire door, a frame, hardware, and other accessories that together provide a specific degree of fire protection to the opening.[來源：美標NFPA 80 2019, 3.3.50]
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