M&G DuraVent announced that US Boiler Co. has now approved PolyPro single-wall, concentric and flex for its Burnham Alpine models 080-500. DuraVent’s PolyPro is an engineered system specifically designed for venting heating appliances. Gasketed joints require no primers or adhesives and easily assemble with just a splash of water. Terminations are designed for superior performance in poor environmental conditions. PolyPro is tested and listed to the ULC S636 standard in Canada and rated as a Class IIA, IIB, and IIC vent system.