Integrity (E): Integrity failure shall be deemed to get transpired if any of the subsequent are observed: Integrity failure takes place about the unexposed side as described in EN 1363-1 Substantial compartments (generally better than 15 meters) are liable to spreading smoke and current a problem for fire protection engineers https://fire-resisting-ductwork-i80011.therainblog.com/35824738/top-latest-five-fire-resisting-ductwork-insulation-urban-news