Section 49(11) in Faridabad Complex Administration Building Rules, 1989
(11)No pipe for the purpose of conveying smoke or other products of combustion shall be allowed to project through the wall externally. Elsewhere such pipes may be mild steel thick or of cast iron complying with the Indian Standard Institution specifications, or if, sheet metal for domestic cooking ranges only and shall be fixed at a distance of at least 20 centimetres from any combustible substance.
