Where the ductwork leaves the compartment from which it serves (demonstrated in blue) it must keep integrity and insulation fire rankings for the same timeframe since the compartment through which it passes. The structural design and style of grease ducts performs a vital part in commercial kitchen protection. A appropriately https://fire-resisting-ductwork-i78899.digitollblog.com/36870099/fire-resisting-ductwork-insulation-no-further-a-mystery