Smoke leakage (S): The duct shall not have a leakage exceeding 5 m³/h per 1 m² of inside floor location. This shall be associated with the floor area on the duct through the perforated plate to the tip from the duct by the inlet nozzles. When the outlet terminates at https://lukasatiwl.madmouseblog.com/17425793/fire-resisting-ductwork-insulation-an-overview