Shaft Door

Shaft Door — Fire-Rated Doors for Electrical and Service Duct Shafts, 1 & 2 Hour

Vertical service shafts in multi-storey buildings — carrying electrical cables, data cabling, HVAC ducts, plumbing pipework, and drainage stacks — penetrate every floor slab from basement to roof. In the event of a fire, these shafts become vertical chimneys, accelerating the spread of fire, smoke, and toxic gases from the floor of origin to every floor above. Fire-rated shaft doors at each floor level break this propagation pathway, containing the fire within a single floor and protecting the entire building above.

NBC 2005 Part 4 Requirements

The National Building Code of India 2005, Part 4 (Fire Protection), Clause 3.4.8.3 mandates specific fire resistance ratings for shaft doors by shaft type:

• Electrical cable shafts: 2-hour fire resistance rating — reflecting the high fire load (electrical cable insulation) present in electrical shafts and the critical importance of preventing inter-floor fire spread through electrical installations
• Service duct and pipe shafts: 1-hour fire resistance rating — for shafts carrying non-electrical services such as water pipework, drainage, and HVAC where the fire load is lower

These are mandatory requirements for all new building construction subject to NBC 2005/2016 and for existing buildings undergoing fire safety upgrades as part of NOC renewal.

Construction

IFES shaft doors are constructed in GI steel with a fire-rated core matched to the required 1-hour or 2-hour rating. The door leaf and frame dimensions are sized to the shaft opening — typically smaller than a standard door as shaft openings are sized for maintenance access rather than pedestrian traffic, but customisable to any opening dimension.

Self-closing mechanism: overhead or concealed door closer ensures the door returns to the closed and latched position after each maintenance access, maintaining the fire barrier at all times. Dead lock: prevents the door from being propped open or inadvertently left unlatched, ensuring the fire compartmentation integrity of the shaft is never compromised between maintenance visits.

Hardware

Self-closing door closer (overhead or concealed), dead lock with key, intumescent and smoke seals on door leaf perimeter, and three SS butt hinges per leaf. Inspection window (fire-rated glass) available on request for shaft inspection without opening the door.

Applications

Electrical cable shaft access doors on every floor penetration level, HVAC duct shaft access doors, plumbing and drainage riser shaft access doors, and all service shaft openings in multi-storey residential, commercial, hospital, and industrial buildings across India.