Fire closures,

Fire closures/dampers
D.4.1 Fire closures at main inlets and outlets
D.4.1.1 The main inlets and outlets of all ventilation systems shall be capable of being closed from
outside the spaces being ventilated. The means of closing shall be easily accessible as well as prominently
and permanently marked and shall indicate whether the shut-off is open or closed.
D.4.1.2 Fire closures at ventilation inlets and outlets located at outside boundaries need not be of approved
type.
D.4.1.3 Fire closures, which are not of approved type, are to comply with the following requirements:
 The thickness of steel fire closures is shown in the following Table 1.2.
 If measures to increase the strength are taken, the thickness may be reduced with agreement of GL.
The construction of approved closures shall comply with the tested ones.
 The means of control is to be capable of being locked in open and closed position.
 When shut, the fire closures shall have close contact with a steel strip throughout their circumference.
All closures shall be easily accessible and capable of being operated easily and safely.
 Hinges and bearings of the fire closures are to be largely maintenance-free and easily accessible for
inspections and repairs.
 The controls and the "open" and "closed” position of the fire closures are to be clearly and permanently
marked.
 Power-driven controls and remote operated controls for fire closures must be provided with a second,
independent power-operating system or manual control operable from a safe position outside
the space to be protected or the closures are to be of fail safe type