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MODELS 678 • 678MX • 679 • 680 • 679FL • 680FL
FAN/LIGHT
COMBINATION VENTILATORS
WARNING
TO REDUCE THE RISK OF FIRE, ELECTRIC
SHOCK, OR INJURY TO PERSONS, OB-
SERVE THE FOLLOWING:
1. Use this unit only in the manner intended by
the manufacturer. If you have questions, con-
tact the manufacturer at the address or tele-
phone number listed in the warranty.
2. Before servicing or cleaning unit, switch
power off at service panel and lock the ser-
vice disconnecting means to prevent power
from being switched on accidentally. When
the service disconnecting means cannot be
locked, securely fasten a prominent warn-
ing device, such as a tag, to the service
panel.
3. Installation work and electrical wiring must
be done by a qualified person(s) in accor-
dance with all applicable codes and stan-
dards, including fire-rated construction
codes and standards.
4. Sufficient air is needed for proper combus-
tion 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 Heat-
ing, Refrigeration and Air Conditioning En-
gineers (ASHRAE), and the local code au-
thorities.
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. If this unit is to be installed over a tub or
shower, it must be marked as appropriate
for the application and be connected to a
GFCI (Ground Fault Circuit Interrupter) - pro-
tected branch circuit.
8. Never place a switch where it can be
reached from a tub or shower.
9. This unit must be grounded.
CAUTION
!
1. For general ventilating use only. Do not use
to exhaust hazardous or explosive materi-
als and vapors.
2. This product is designed for ceiling installa-
tion only. This product is designed for instal-
lation in ceilings up to a 12/12 pitch.
Ductwork must point up. DO NOT MOUNT
THIS PRODUCT IN A WALL.
3. To avoid motor bearing damage and noisy
and/or unbalanced impellers, keep drywall
spray, construction dust, etc. off power unit.
3. Please read specification label on product
for further information and requirements.
READ AND SAVE THESE INSTRUCTIONS
TYPICAL INSTALLATIONS
HOUSING
CEILING
JOIST
MOUNTING TABS
GRILLE
CEILING
MATERIAL
POWER CABLE
HOUSING
CEILING
JOIST
MOUNTING TABS
GRILLE
CEILING
MATERIAL
POWER CABLE
4" ROUND
DUCT
ADDITIONAL
FRAMING
HOUSING MOUNTED
TO ADDITIONAL FRAMING
Discharge 90
0
to joists.
HOUSING MOUNTED
DIRECTLY TO JOIST
2x6 (or larger)
Discharge parallel to joists.
HOUSING
2 x 4
CEILING
JOIST or
TRUSS
MOUNTING
TABS
CEILING
MATERIAL
POWER CABLE
ADDITIONAL
FRAMING
2 x 4
CEILING
JOIST or
TRUSS
GRILLE
HOUSING MOUNTED
TO 2x4 TRUSS
Requires additional framing
for mounting tabs.
Discharge parallel to joists.
HOUSING
MOUNTING
TABS
CEILING
MATERIAL
POWER CABLE
ADDITIONAL
FRAMING
"
I
"
JOIST
"
I
"
JOIST
GRILLE
HOUSING MOUNTED TO “I” JOIST
Requires additional framing
for mounting tabs.
Discharge parallel to joists.
HOUSING
2 x 4
CEILING
JOIST or
TRUSS
MOUNTING TABS
CEILING
MATERIAL
POWER CABLE
4" ROUND
DUCT
ADDITIONAL
FRAMING
2 x 4
CEILING
JOIST or
TRUSS
GRILLE
HOUSING MOUNTED TO 2x4 TRUSS
Requires additional framing
for mounting tabs.
Discharge 90
0
to joists.
HOUSING
MOUNTING TABS
CEILING
MATERIAL
POWER CABLE
4" ROUND
DUCT
ADDITIONAL
FRAMING
"
I
"
JOIST
"
I
"
JOIST
GRILLE
HOUSING MOUNTED TO “I” JOIST
Requires additional framing
for mounting tabs.
Discharge 90
0
to joists.
Installer: Leave this manual with the homeowner.
Homeowner: Use and Care information on page 4.
*
Additional framing must be a 2x6 (minimum height), at least 9-inches long.
*
*
*
*
*
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