FACTORIES AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
Regulation 28. Dampers.
(1) No damper which may entirely close a flue or uptake shall be fitted to any steam boiler fired by
oil or pulverised fuel unless such damper is interlocked with the burners so that they cannot
function when the damper is closed.
(2) Where the provisions of paragraph (1) of this regulation are not satisfied means shall be
provided to prevent the damper closing more than ninety per centum of the area of the flue or
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