Direct Vent Pro by M&G Duravent (previously Simpson Duravent) is a top quality chimney system made specifically for direct vent gas appliances. It's twist-lock design allow a quick, secure, fastener free connection. Duravent "Direct Vent Pro" is the most recommended system in the industry and listed in some appliance manufacturers instruction manuals specifically. The 5" x 8" DirectVent Pro Pipe includes:
Coaxial design allows combustion air to enter and exhaust to exit for direct vent specific appliances.