Integrity (E): Integrity failure shall be deemed to possess transpired if any of the following are noticed: Integrity failure happens to the unexposed aspect as defined in EN 1363-1 Solution of selection to guard kitchen area exhaust ducts, ducts for smoke Manage, and other air distribution methods Encyclopaedia Britannica's editors https://fireresistingductworkinsu23455.digitollblog.com/36831625/everything-about-fire-resisting-ductwork-insulation