Smoke leakage (S): The duct shall not have a leakage exceeding five m³/h for each 1 m² of internal floor location. This shall be associated with the area location of the duct within the perforated plate to the tip of the duct with the inlet nozzles. Pressurisation ducts ought to https://fire-resisting-ductwork-i56778.dgbloggers.com/37526485/rumored-buzz-on-grease-tight-extract-ductwork