Smoke leakage (S): The duct shall not Use a leakage exceeding 5 m³/h per one m² of inside surface area place. This shall be associated with the surface location of the duct in the perforated plate to the end on the duct because of the inlet nozzles. ROCKWOOL Curtainrock® is https://greasetightextractductwor13345.activoblog.com/42604765/considerations-to-know-about-grease-tight-extract-ductwork