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MODELS 744L • 744RL • 744RNL
The ducting from this fan to the outside of the building has a strong
effect on the air flow, noise and energy use of the fan. Use the
shortest, straightest duct routing possible for best performance,
and avoid installing the fan with smaller ducts than recommended.
Insulation around the ducts can reduce energy loss and inhibit
mold growth. Fans installed with existing ducts may not achieve
their rated airflow.
Plan to supply the unit with proper line voltage and appropriate
power cable.
INSTALLATION
2. Mark mounting location.
Position unit between joists and extend mounting brackets.
IMPORTANT: Position brackets so there will be an 1/8” gap
between bottom of housing and ceiling material.
Mark the
top of keyhole slot on all four mounting brackets.
The unit must not be installed above or inside the cooking area shown.
Do not install in a cooking area.
COOKING AREA
Do not install above
or inside this area
Cooking
Equipment
Floor
45
45
1/8" GAP
1. Install mounting brackets.
Slide the adjustable mounting brackets into the bracket channels
on the housing.
CARDBOARD PROTECTOR
*Purchase
separately.
INSULATION*
(Place around and
over Fan Housing.)
ROOF CAP*
(with built-in
damper)
FAN
HOUSING
POWER
CABLE*
4-IN. ROUND
DUCT*
4-IN.
ROUND
ELBOWS*
Seal gaps
around
Housing.
Seal duct
joints with
tape.
OR
Keep duct
runs short.
WALL CAP*
(with built-in
damper)
Bend the tabs on the cardboard protector and insert protector into
opening in housing.
NOTE: The cardboard protector shields the inside of the housing
from drywall spray and construction dust. Do not remove it until
after construction is completed.
3. Pound in nails.
Remove unit temporarily, and pound nails partially into joists at
all four marked locations.
4. Hang and secure housing.
Hang unit from nails. Check to make sure that there will be a 1/8”
gap between bottom of housing and ceiling material. Pound nails
tight. For wide joist centers: A #8 x 3/8 self-tapping screw can be
used to join extended brackets together and create a rigid mount.
To ensure a noise-free mount, crimp the bracket channels tightly
around mounting brackets.
