Smoke leakage (S): The duct shall not Have got a leakage exceeding 5 m³/h for each one m² of internal surface area space. This shall be linked to the floor area on the duct within the perforated plate to the end in the duct via the inlet nozzles. The basement https://garrettrgvjw.bloggactivo.com/36193489/indicators-on-fire-resisting-ductwork-insulation-you-should-know