This is 6″ x 24″ Ventis Class A All Fuel Chimney Pipe.
Ventis Stove and Chimney pipe are compatible with only other Ventis pipe. You can not mix and match with other manufacturers of stove and chimney pipe. They will not mate together properly.
The Ventis Class-A Solid Fuel Chimney system is designed for appliances that are tested and listed for use with a 2100 Degrees Fahrenheit HT chimney system, such as wood stoves, fireplaces, furnaces, boilers, ranges, water heaters, or other appliances fueled by wood, oil, or coal.