Smoke leakage (S): The duct shall not Have a very leakage exceeding 5 m³/h per one m² of inside area region. This shall be relevant to the surface area space in the duct from your perforated plate to the end of your duct with the inlet nozzles. These regulations are https://fire-resisting-ductwork-i34556.liberty-blog.com/37181350/the-best-side-of-grease-tight-extract-ductwork