Smoke leakage (S): The duct shall not Possess a leakage exceeding five m³/h per one m² of internal floor region. This shall be connected to the surface area space on the duct from the perforated plate to the tip from the duct from the inlet nozzles. The structural layout of https://fire-resisting-ductwork-i45667.ageeksblog.com/35739983/5-essential-elements-for-grease-tight-extract-ductwork