Place of special fire hazard
The building regulations Approved Document B, ‘Fire safety’, suggests that 'places of special fire hazard' include:
- Oil-filled transformer rooms.
- Switch gear rooms.
- Boiler rooms.
- Storage spaces for fuel or other highly flammable substance(s).
- Rooms that house a fixed internal combustion engine.
Every place of special fire hazard should be enclosed with fire-resisting construction. Any such walls and floors are not compartment walls or compartment floors.
A protected lobby should be provided between an escape stairway and a place of special fire hazard. The lobby should have not less than 0.4m² permanent ventilation, or should be protected from the ingress of smoke by a mechanical smoke control system.
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