What are the core performance criteria for a fire door?

Integrity (preventing the passage of flames and hot gases) and Insulation (limiting the temperature rise on the unexposed side).

Are door closers mandatory on fire doors?

Yes, all fire doors must be self-closing and self-latching to maintain compartmentalization during an emergency.

Can standard glass be used in a fire door?

No, any vision panel must use fire-rated wire-cast or clear fire-resisting glass that matches the door's fire rating.

IS 3614

: 2017

Specification for Fire Resisting Doors

CurrentFrequently UsedSpecificationBIMFire Safety · Fire Safety

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This standard lays down the specifications, material requirements, and performance criteria for fire-resisting doors. It ensures that doors provide the necessary integrity and insulation to compartmentalize fires and secure safe egress routes.

Lays down requirements for the design, materials, construction, and testing of fire resisting doors for various applications.

Quick Reference Values

standard fire ratings30, 60, 90, 120 minutes

max gap between door and frame3 mm

bottom sill clearanceMaximum 3 to 5 mm (depending on drop seal)

min steel thickness for frame1.6 mm (typical)

min steel thickness for leaf1.2 mm (typical)

Practical Notes

Fire doors must always be fitted with functional self-closing devices; a fire door propped open is entirely ineffective.

On-site modifications such as planing, drilling for new hardware, or cutting louvers typically void the manufacturer's fire rating certification.

Intumescent seals are critical; ensure they are properly installed around the frame or door edges to expand and seal gaps during a fire.