Smoke leakage (S): The duct shall not have a leakage exceeding 5 m³/h per 1 m² of internal surface area. This shall be connected with the area region in the duct within the perforated plate to the end of your duct from the inlet nozzles. Stone wool insulation is fire https://fireresistingductworkinsu57899.estate-blog.com/36066735/5-essential-elements-for-fire-resisting-ductwork-insulation