Flame Retardant Glass-Fiber Ducting Hose —Resistant To 400℃ Flame Retardant Glass-Fiber Ducting Hose is made of double-ply silicone coated fiberglass fabric hose mechanically crimped in a continuous process. This makes this flexible ducting hose extremely good wear resistance, it will not damage the high temp duct when it is dragged on the ground. Ecoosi…