Figure 2: Fan Panel Mounted Inside of Wall – Venturi Not Protruding
Cut and frame the wall opening so the fan panel fits inside the opening. The fan venturi should not extend beyond the outside of the wall.
- Mount the fan into framed opening with screws or bolts through the fan flange.
- Secure damper to framed opening with screws through the damper flange.
Note: When using this installation method, make sure an oversized damper is purchased large enough to cover the fan panel dimensions.
Example: A 24” exhaust fan has a panel size of 30” x 30” O.D.Therefore, use a 30” shutter to cover the opening.