Smoke leakage (S): The duct shall not have a leakage exceeding 5 m³/h for every 1 m² of inside surface area area. This shall be connected to the surface region of the duct from the perforated plate to the tip in the duct through the inlet nozzles. In addition, these https://fireresistingductworkinsu89900.blog-eye.com/37255815/not-known-facts-about-fire-resisting-ductwork-insulation