Smoke leakage (S): The duct shall not Use a leakage exceeding 5 m³/h for each one m² of inner area location. This shall be associated with the floor area in the duct from the perforated plate to the end on the duct from the inlet nozzles. Stone wool insulation is https://greasetightextractductwor23344.blogsidea.com/43516662/about-grease-tight-extract-ductwork