Smoke leakage (S): The duct shall not have a leakage exceeding five m³/h per one m² of inner area spot. This shall be associated with the area region with the duct from your perforated plate to the top of the duct via the inlet nozzles. These laws are in position https://fireresistingductworkinsu46778.get-blogging.com/37587890/top-guidelines-of-grease-tight-extract-ductwork