Smoke leakage (S): The duct shall not Have a very leakage exceeding five m³/h per one m² of interior surface place. This shall be linked to the floor area in the duct within the perforated plate to the end in the duct via the inlet nozzles. CE & UKCA marked https://grease-tight-extract-duct35567.vblogetin.com/42909441/detailed-notes-on-fire-resisting-ductwork-insulation