(a)The sleeves shall have a thickness of at least 3 mm and a length of at least 900 mm. When passing through bulkheads, such length shall be divided preferably into 450mm on each side of the bulkhead. These ducts, or sleeves lining such ducts shall be provided with fire insulation. The insulation shall have at least the same fire integrity as the bulkhead or deck through which the duct passed. Equivalent penetration protection may be provided to the satisfaction of the Chief Surveyor with the Government of /India.
(b) Ducts with a free cross-sectional area exceeding 0.075m shall be fitted with fire dampers in addition to the requirements of clause.
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