Integrity (E): Integrity failure shall be considered to have happened if any of the next are noticed: Integrity failure happens around the unexposed facet as defined in EN 1363-one Grease duct is welded to be able to reduce fires a result of the flammability of the hot grease igniting development https://kameronwmaoc.bloggazzo.com/35938174/getting-my-fire-resisting-ductwork-insulation-to-work