The Correct Way to Connect the Damper Duct on a Nutone Model 765HL

A NuTone model 765HL, a ventilation fan with a heater and light, attaches to a building's ventilation duct with a damper fitting. The 4-inch round duct the 765HL connects to exits the building through either the roof or an exterior wall. Correctly connecting the NuTone 765HL's damper fitting prevents outside air from back-flowing into the fan. A NuTone 765HL uses a dedicated 120-volt 20-amp power source. The 765HL's 1,500-watt heater has a rotating louver that directs heat to all parts of the bathroom.

Metal-backed duct tape
Squeegee

Instructions

- 1
  Align the nipples on the damper blade with the slots in the square end of the NuTone 765HL's damper fitting. Insert one nipple into its slot in the damper fitting. Bend the damper blade slightly and carefully press the other nipple into its slot. Release the damper blade.
- 2
  Hold the square side of the damper fitting, with the hinged side of the damper blade facing up, against the duct opening on the 765HL's housing. Keep the top of the damper fitting flush with the top of the 765HL's housing.
- 3
  Snap the damper fitting's locking tabs into the slots in the side of the 765HL's housing.
- 4
  Slip the building's 4-inch round ventilation duct over the round end of the 765HL's damper fitting.
- 5
  Apply a piece of metal-backed duct tape to the seam between the NuTone 765HL's housing and its damper fitting. Position half the tape on the housing and half on the fitting. Cover the seam on all four sides of the fitting.
- 6
  Press the tape against the fitting and the housing with a squeegee. Remove all the bubbles and wrinkles in the tape with the squeegee.
- 7
  Cover the seam between the 4-inch round ventilation duct and the 765HL's damper fitting with the metal-backed duct tape. Press the tape against the seam with the squeegee, removing all bubbles and wrinkles.

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