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MODEL 773BNNT
3. Set housing
aside and drive
nails partially
into joist at the
top of both key-
hole marks.
4. Hang housing from
nails and pound
nails tight. To en-
sure a noise-free
mount, pound an-
other nail through
the top hole of each
mounting tab.
Existing Construction
2. In attic, position mounting brackets against joist. Trace
outline of housing on ceiling material.
1. Choose the location for your fan/light in the ceiling. For best
possible performance, use the shortest possible duct run
and a minimum number of elbows.
3. Set housing aside and cut ceiling opening slightly larger
than marked.
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 MANNER. (Additional framing must be a 2x6 (mini-
mum height), at least 9-inches long.)
4. Place housing in opening so that its bottom edge is flush
with finished ceiling. Nail to joist through keyhole on both
sides. To ensure a noise-free installation, drive another nail
through the top hole of each mounting bracket.
5. Additional mounting holes are provided for installations
where access from above is inconvenient or not possible.
Nail or screw housing directly to joists or framing.
Recommended: Seal between ceiling material & housing
on all 4 sides to prevent air leakage.
ADDITIONAL
MOUNTING
HOLES
RECOMMENDED: SEAL BETWEEN
CEILING MATERIAL & HOUSING (4 SIDES)
