• Efficient, economical, and easily installed • Crafted for use with all listed gas appliances having draft hoods, or other applications listed to be used with Type B Gas Vent • Approved for such residential applications as boilers, furnaces, water heaters, and space or wall heater venting • Single or multi-appliance hook-ups • UL/ULC approved • Outside casing of galvalume steel • Inside conduit of aluminum