Hull Construction Regulations

234 (1) Where a ventilation duct greater than 0.075 m² in cross-section passes through an ‘A’ Class division, the duct shall be fitted with a fire damper that is

• (a) of the fail-safe automatic closing type;

• (b) capable of being closed manually from both sides of the division; and

• (c) fitted with an indicator that shows whether the damper is open or closed.

(2) Where a ventilation duct passes through a space that is enclosed by ‘A’ Class divisions but does not serve that space and the duct does not have a fire rating at least equal to that of the division that it pierces, the duct shall be fitted at each point at which the duct pierces a division with a fire damper described in subsection (1).