Smoke leakage (S): The duct shall not have a leakage exceeding five m³/h for each 1 m² of internal surface region. This shall be associated with the surface area place in the duct within the perforated plate to the top of the duct with the inlet nozzles. Additionally, these obtain https://grease-tight-extract-duct45678.tokka-blog.com/37187270/top-guidelines-of-grease-tight-extract-ductwork