6" diameter. Made of Galvalume Double wall. A vent pipe with a 6" inner diameter is required for this unit. The DuraTech 6" Diameter Extended Roof Bracket for 6" and 8" Chimney Pipe will provide you genuine peace of mind if your chimney extends more than four feet above the roof. You won't have to worry about your roof's slope because the legs will stretch to accommodate different roof slopes. Thanks to innovative sandwich clamps, the legs can be extended from 67" to 114". The bracket's role is to keep the chimney stable in the face of wind and snow. Brackets for mounting and adjustable tubing are included. It maintains a cool outside wall while maintaining high flue gas temperatures for optimal draft performance.

6" diameter Made of Galvalume Double wall construction