Smoke leakage (S): The duct shall not Have got a leakage exceeding five m³/h for every one m² of interior surface area space. This shall be relevant to the floor place with the duct in the perforated plate to the end in the duct by the inlet nozzles. These restrictions https://greasetightextractductwor23445.prublogger.com/36005521/5-essential-elements-for-grease-tight-extract-ductwork