Smoke leakage (S): The duct shall not have a leakage exceeding 5 m³/h for each one m² of internal surface area region. This shall be connected to the surface area location of your duct in the perforated plate to the tip of your duct by the inlet nozzles. Pressurisation ducts https://elliottzsgui.ltfblog.com/35674498/not-known-factual-statements-about-grease-tight-extract-ductwork