IS 3614:2021 is the Bureau of Indian Standards specification for fire check doors — doors engineered and manufactured to resist the passage of fire, heat, and smoke for a defined fire resistance period. These doors form a critical component of passive fire protection systems in buildings across India.
A fire door certified under IS 3614:2021 must demonstrate its fire resistance performance under actual fire test conditions — not just construction quality inspection. Key requirements include:
Fire resistance period — the door must maintain structural integrity and insulation for its rated fire resistance period under standardised fire test conditions defined in IS 3614:2021
Door leaf construction — material specifications, steel gauge, and core composition requirements for the door panel
Frame integrity — the frame must maintain its shape and seal the door opening throughout the fire resistance period
Hardware performance under fire — hinges, latches, closers, and other fittings must function correctly under thermal stress
Intumescent sealing — the door must carry correctly specified intumescent strips that expand under heat to seal the gap between door and frame, preventing smoke passage
Dimensional accuracy — clearances between door leaf and frame must conform to specified tolerances
Marking requirements — ISI Mark, fire resistance rating, and manufacturer identification must be permanently marked on every certified fire door
BIS certification under IS 3614:2021 is mandatory for fire door manufacturers under the BIS Act, 2016. Fire doors are specified in building codes, fire safety regulations, National Building Code of India provisions, and project tender documents - making BIS ISI Mark certification an absolute prerequisite for supplying to any regulated construction project in India.
INTERNAL LINK: BIS Certification for Fire Doors - IS 3614:2021