Installation Guide
MODELS 770RLTK, 770RLTKC, 770RNLTK
Register this product at www.broan.com/register or www.nutone.com/reg-
ister. For Warranty Statement, or to order Service Parts: go to www.broan.
com and type the Model in the “Model Search” field at the top of the page.
Broan, 926 W. State Street, Hartford, WI 53027 800-558-1711 or 
888-336-3948
1
Ventilation Fan with Decorative Light
READ AND SAVE THESE INSTRUCTIONS
WARNING   
TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PER-
SONS, OBSERVE THE FOLLOWING:
1.  Use this unit only in the manner intended by the manufacturer. If you 
have questions, contact the manufacturer at the address or telephone 
number listed in the warranty.
2. Before servicing or cleaning unit, switch power off at service panel 
and lock the service disconnecting means to prevent power from be-
ing 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.
3. Installation work and electrical wiring must be done by a qualified 
person(s) in accordance with all applicable codes and standards, 
including fire-rated construction codes and standards.
4. Sufficient air is needed for proper combustion and exhausting of 
gases through the flue (chimney) of fuel burning equipment to prevent 
backdrafting. 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.
5.  When cutting or drilling into wall or ceiling, do not damage electrical 
wiring and other hidden utilities.
6.  Ducted fans must always be vented to the outdoors.
7.  Do not install in a bathtub or shower enclosure.
8.  This unit must be grounded.
9.  This unit is U.L. listed. Type I.C. inherently protected.
CAUTION 
!
1.  For general ventilating use only. Do not use to exhaust hazardous or 
explosive materials and vapors.
2.  This product is designed for installation in FLAT CEILINGS ONLY. Do 
not mount this product in a wall.
3.  The light fixture assembly must be mounted to the fan housing assembly 
included with this product. Do not mount the light fixture assembly to 
a wiring outlet box.
4.  To avoid motor bearing damage and noisy and/or unbalanced impellers, 
keep drywall spray, construction dust, etc. off power unit.
5.  Please read specification label on product for further information and 
requirements.
TYPICAL INSTALLATIONS
HOUSING MOUNTED
DIRECTLY TO JOIST 
2x6 (or larger) 
Discharge parallel to joists.
HOUSING 
2 x 4 
CEILING 
JOIST or 
TRUSS 
MOUNTING 
TABS 
POWER CABLE 
ADDITIONAL 
FRAMING 
2 x 4 
CEILING 
JOIST or 
TRUSS 
CEILING 
MATERIAL 
GRILLE 
PAN 
GLASS
LIGHT SHADE
HOUSING MOUNTED 
TO 2x4 TRUSS
Requires additional framing
for mounting tabs.
Discharge parallel to joists.
HOUSING MOUNTED 
TO “I” JOIST
Requires additional framing 
for mounting tabs.
Discharge parallel to joists.
*
 Additional framing must be a 2x6 (minimum height).
*
*
SUSPENDED CEILINGS
Housing hung with wires - 
3-point mount.
PLAN THE INSTALLATION
ROOF CAP*
(with built-in
damper)
WALL CAP*
(with built-in
damper)
4-IN. ROUND
ELBOWS*
4-IN. ROUND
DUCT*
FAN
HOUSING
Seal gaps
around
housing.
Seal duct
joints with
tape.
Keep duct
runs short.
INSULATION
(Place around and
over fan housing.)
POWER
CABLE*
*Purchase
separately.
OR
INSTALL THE HOUSING
1. Choose the location for your fan in the ceiling. For best possible 
performance, use the shortest possible duct run and a minimum 
number of elbows.
2. Position mounting brackets 
against joist so that bottom 
edge of housing will be flush 
with finished ceiling.
Additional positioning 
feature for 5/8”, 1”, &
1-1/4” thick ceiling material:
Holes in corners of housing 
are labeled with various ceiling 
material thicknesses. Position 
housing so bottom edge of joist is visible through a matched 
set of holes. The housing is now in the proper position for that 
ceiling material thickness.
Additional positioning feature for 1/2” thick ceiling material:
Bend two tabs, on side of housing, 
90
0
 outward. Lift housing until 
tabs contact underside of joist.
Mark the keyhole slot on both mounting brackets.
New Construction
5/8
1
1-1/4
TAB
HOLES
BOTTOM EDGE OF JOIST
- PLEASE NOTE -
THE FOLLOWING INSTALLATION ILLUSTRATIONS SHOW 2 X 6 
JOISTS. IF YOU HAVE A TRUSS OR “I”-JOIST INSTALLATION, MOUNT 
THE VENTILATOR TO THE ADDITIONAL FRAMING IN THE SAME MAN-
NER. (Additional framing must be a 2x6 (minimum height).










