- Diameter: 4 ID x 6 5/8 OD.
- Construction Materials: .020 aluminum inner wall with .018 galvanized steel outer wall.
- Clearances: Specified by the appliance manufacturer.
- Listings: DirectVent Pro, in combination with the gas appliance, has been tested and listed as
- Adapts to stoves with a 4 x 6-5/8 co-axial outlets.