This Master Flow 3-1/4 in. x 10 in. Rectangular Stack Duct Starting Collar is made of durable, galvanized steel. It is used to transition from plenums (duct board or lined) or a flat surface to 3.25 in. x 10 in. stack duct. It installs easily with sheet-metal screws.
- Galvanized-steel construction
- Use to transition from ductboard plenums, lined plenums, or flat surfaces to 3-1/4 in. x 10 in. stack duct
- Installs with sheet-metal screws
- Insulate ductwork for system efficiency and comfort
- Seal seams with code-approved mastic, sealant or duct tape (not included)