The outside diameter of the valve is undersized to fit inside standard duct sizes. Once the valve slips inside the duct:
- Secure the valve with sheet metal screws.
- To ensure the seal is air tight, apply a duct seal.
- Ensure the metal straps support both sides of the valve weight and the duct work.
For correct hardware, mounting, sealing and installation requirements, consult local building codes.
Figure 1. Mounting a slip-in valve