Grease duct joints are held with each other by way of fashioned V clamps and sealed with 3M Fire Barrier 2000+. Fire resistant board for sealing support penetrations in walls or floors Integrity (E): Integrity failure shall be deemed to possess occurred if any of the following are noticed: Integrity https://israelcuixl.bleepblogs.com/37353315/fire-resisting-ductwork-insulation-things-to-know-before-you-buy