Smoke leakage (S): The duct shall not Have got a leakage exceeding 5 m³/h per 1 m² of internal surface spot. This shall be connected to the area location of the duct through the perforated plate to the end with the duct through the inlet nozzles. Promat has formulated self-supporting https://mariomdrfu.prublogger.com/36106211/5-simple-techniques-for-fire-resisting-ductwork-insulation