Hong Kong Regulations

BOILERS AND PRESSURE VESSELS REGULATIONS - REGULATION 11

Flue dampers

(1) Every flue damper fitted in a fuel burning installation shall be so
constructed that it can be fixed securely in an open position.

(2) Save as provided in subregulation (3), the area of any such flue damper
shall be such that it does not obstruct more than 90% of the free space of the
flue.

(3) Where any such flue damper does not comply with subregulation

(2), the flue damper shall be interlocked with the fuel supply or otherwise so
arranged that the fuel burning installation cannot be started up or operated
when the flue is closed.