NuTone Ventilation Hood WHV 20 User Manual

®
INSTALLATION INSTRUCTIONS  
READ & SAVE THESE INSTRUCTIONS!  
Whole House Ventilator  
MODEL WHV-20  
IMPORTANT SAFETY INSTRUCTIONS  
WARNING: TO REDUCE THE RISK OF FIRE.  
ELECTRIC SHOCK, OR INJURY TO PERSONS,  
OBSERVE THE FOLLOWING:  
A. Use this unit only in the manner intended by the  
manufacturer. If you have questions, contact the  
manufacturer.  
221/2  
"
261/2  
"
CUTOUT  
B. Before servicing or cleaning unit, switch power off at  
service panel and lock service panel to prevent power  
from being switched on accidentally.  
When the service disconnecting means cannot be locked,  
securely fasten a prominent warning device, such as a tag,  
to the service panel.  
CAUTION:  
FIGURE 1  
For general ventilating use only. Do not use to  
exhaust hazardous or explosive materials and vapors.  
CAUTION:  
This unit has an unguarded impeller. Do not use  
in locations readily accessible to people or animals.  
223/8  
"
263/8  
"
INSTALLATION INSTRUCTIONS  
WARNING: TO REDUCE THE RISK OF FIRE,  
ELECTRIC SHOCK, OR INJURY TO PERSONS,  
OBSERVE THE FOLLOWING:  
101/4  
"
A. Installation work and electrical wiring must be done by  
qualified person(s) in accordance with all applicable codes  
and standards, including fire-rated construction.  
B. Sufficient air is needed for proper combustion and  
exhausting of gases through the flue (chimney) of fuel  
burning equipment to prevent back drafting. Follow the  
heating equipment manufacturer’s guideline and safety  
standards such as those published by the National Fire  
Protection Association (NFPA), and the American Society  
for Heating, Refrigeration, and Air Conditioning  
Engineers (ASHRAE), and the local code authorities.  
C. When cutting or drilling into wall or ceiling, do not damage  
electrical wiring and other hidden utilities.  
MOUNTING  
CLIPS  
2" x 6" JOIST  
2" x 4" JOIST  
FIGURE 2  
FAN INSTALLATION  
1. Select location for fan in ceiling.  
2. Locate ceiling joists.  
3. Refer to Figure 1. Using a right angle square to mark  
location of cutout for unit size 221/2" x 261/2" long.  
4. Refer to Figure 2. Cutout in ceiling must be directly  
in line with the inside face of joists.  
5. Refer to Figure 2. The mounting clips on this unit are  
mounted for 2" x 4" construction. After determining size  
of joist, relocate the mounting clips if necessary and  
reassemble securely.  
6. Refer to Figure 3. Push fan housing into ceiling cutout.  
Support clips will hold housing in place on joists.  
7. Push fan housing flush to ceiling and drill mounting holes  
in joists through holes in housing and secure in place with  
screws provided (No. 12 x 1" wood screw.)  
D. Ducted fans must always be vented to the outdoors.  
E. If this unit is to be installed over a tub or shower,  
it must be marked as appropriate for the application.  
F. NEVER place a switch where it can be reached from  
a tub or shower.  
WARNING: To reduce the risk of fire or electric shock,  
use only NuTone specified solid-state speed control as  
indicated on this products data label.  
Designed for installation between 24" OC ceiling joist with  
no framing necessary. If the building structure has 16" OC  
joist, this unit will require framing.  
Discharge opening requires one (1) square foot for every  
750 CFM of fan rating.  
 

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