Insulation: Some time all through which the duct is exposed to fire until a decline of fabric insulation stability takes place. The gasoline's condition also affects burning velocity. Skinny items of gas melt away extra quickly than larger sized items due to the fact a bigger proportion in their mass https://fire-resistant-ductworth12233.blogacep.com/41677866/5-easy-facts-about-fire-resistant-ductworth-isntallers-described