Smoke leakage (S): The duct shall not Have a very leakage exceeding five m³/h per one m² of interior floor area. This shall be connected with the surface area place from the duct within the perforated plate to the tip in the duct because of the inlet nozzles. These rules https://grease-tight-extract-duct46778.blogsvila.com/37074755/5-essential-elements-for-grease-tight-extract-ductwork