In almost any case, the fire overall performance of the duct which penetrates a fire resisting or separating factor need to require thorough consideration by specifiers. ROCKWOOL ROXUL Harmless® is usually a stone wool insulation used in fire-stopping programs. It is actually designed to fill perimeter gaps amongst concrete ground https://fire-rated-insulation-for13455.blogpixi.com/37152659/fire-rated-insulation-for-ductworth-for-dummies