NuTone 9905-RO2 Installation Instructions Manual

®

Heat-A-Vent
Combination

INSTALLATION INSTRUCTIONS

READ & SAVE THESE INSTRUCTIONS!

93⁄4”

MODEL: 9905-RO2

FOR BEST RESULTS

In a new construction site, install the housing (complete 
with heater and ventilator) during rough-in construction of  
the building. The grille should be installed when the finished 
ceiling is in place.
    Installation in an existing, finished building requires 
an accessible area (attic or crawl space) above the 
planned location. See “INSTALLATION IN EXISTING 
CONSTRUCTION.”
    Do not install closer than 12 inches to a vertical surface. 
Do not install over tub or shower enclosure.

   • 

 For installation in sloped ceilings up to 12/12 pitch.

   • Ductwork must point up.

UNIT DIMENSIONS

Refer to Figure 1 for housing’s dimensions.
NOTE: If there will be a finished second floor above,
the Model 9905 housing requires a minimum of 2” x 8”
joist construction for mounting.

73⁄4”

14”

FIGURE 1

WIRING AND DUCTWORK

1.  Run the required wiring during rough-in stage of construction.

2.  Total connected load: 1630 watts.

3.  Plan to run 120vAC, 60 Hz wiring (with ground) on a 
separate 20 Amp circuit from a power source, through 
the provided wall switch, to the housing’s junction box. 
See wiring diagram.

4.  Use 4” round duct.

INSTALLATION IN
NEW CONSTRUCTION

PREPARATION

1.  Loosen hanger bar brackets to allow bars to be inserted.

2.  Refer to Figure 2. Insert hanger bars into brackets.

3.  Refer to Figure 3. Slide hanger bar brackets down to end 
of slot closest to outside edge of housing. Tighten brackets 
in this position.

4.  Refer to Figure 4. Remove junction box cover by 
removing one screw.

5.  Refer to Figure 4. Remove appropriate wiring knockout(s) 
and install approved box connector(s).

HANGER BARS

FIGURE 2

VENT

JUNCTION
BOX
COVER

HEAT

ADJUSTMENT
SLOT

KNOCKOUTS

FIGURE 3 FIGURE 4

MOUNTING THE HOUSING

HEAT

VENT

HEATER
JUNCTION BOX

HEATER
(WHITE)

RED

WHT

BLU.

WHT

VENT

SWITCH

BOX

120vAC
LINE

GROUND

WHITE

BLACK

T

NOTE:
WHEN THERMOSTAT
OR TIMER IS USED,
CONNECT AT

T

1. Locate housing between joists.

2.  Refer to Figure 5. Using nails, secure hanger bars to joists.

NOTE: The hanger bar brackets are adjustable.
Allowing for the thickness of the finished ceiling,
mount hanger bars so that edge of housing will be
flush with the finished ceiling.

3.  Adjust brackets as required. Tighten brackets.

INSTALLING THE DUCTWORK

1.  Refer to Figure 5. Install duct collar.

2.  Using 4” round duct, connect duct to collar and tape 
connection.

INSTALLING THE SWITCH

1.  Install double-gang switch box in chosen location.

2.  Refer to Figure 6. Run wiring and make wiring 
connections.

3.  Use supplied screws to secure switch bracket assembly 
to switch box.

4.  Using supplied screws, secure wall plate to switch bracket.

INSTALLING AND CONNECTING THE WIRING

Refer to Figure 6.
All wiring must comply with local codes and unit must
be properly grounded.

1.  Using 12-gauge wire, run 120vAC, 60 Hz wiring (with 
ground) from a power source to the wall switch location.

The unit must be wired on a separate 20 Amp circuit.

2.  Run wiring from switch location to housing as shown in the 
wiring diagram.

3.  Make wiring connections as shown in wiring diagram.

4.  Replace junction box cover. Slide slotted hole in cover 
over screw. Tighten screw securely.

5.  Secure wire cover with one screw.

6.  Insert heater and ventilator plugs into proper receptacles 
as shown.

DUCT COLLAR

FIGURE 5

MOUNTING THE GRILLE ASSEMBLY

1.  Refer to Figure 7. Using two screws (provided), secure 
grille to housing.

FIGURE 6