Smoke leakage (S): The duct shall not Possess a leakage exceeding five m³/h per 1 m² of inside surface spot. This shall be associated with the floor space in the duct within the perforated plate to the end on the duct via the inlet nozzles. Suited to indoor use without https://grease-tight-extract-duct11223.liberty-blog.com/37020879/indicators-on-fire-resisting-ductwork-insulation-you-should-know