Flamebar BW18 fire resisting ductwork procedure is made in sections and assembled on web site utilising examined fireproof gaskets/sealants. Smoke leakage (S): The duct shall not Use a leakage exceeding five m³/h for each one m² of internal floor space. This shall be relevant to the surface area space in https://caswell-group12234.pointblog.net/detailed-notes-on-ductworth-installation-82562423