Laboratory Exhaust System
8
®
WARNING
In a kitchen exhaust application, do not use a speed
control or isolation damper.
NOTE
In a kitchen fan and high temperature applications
exhaust upblast fans must have external wiring.
Kitchen Roof Mounting Installation
UL/cUL 762 installation for restaurant applications
1. The size of the duct must be equal to the inlet opening.
2. Secure the fan to curb at all four corners using a
minimum eight anchor bolts, lag screws or other
suitable fasteners.
3. Use optional grease trap and external junction box.
4. Area codes may require a continuous weld between
duct and inlet.
5. To comply with NFPA 96, the discharge is required
to be a minimum of 40 inches
(1016 mm)
above the
roof deck and a minimum of 10 ft. from any building
air intake. The minimum velocity in the duct should be
500 ft/min. or greater.
6. Ductwork to an upblast discharge exhaust fan is
constructed of carbon steel not less than 16 MSG
(1.6 mm)
and extends a minimum of 18 inches
(457 mm)
above the roof surface.
7. Ensure that a minimum of 500 ft/min. of air velocity
through the fan is maintained per NFPA 96, clause
8.2.1.1, 2008 edition and UL 762, Issue #5,
December 19, 2003, clause 6.2.
Grease Trap
A grease trap is an aluminum trap designed to collect
grease residue to avoid drainage onto roof surface. It
contains a built-in water separating baffle.
Instructions
1. Apply cover to grease trap. Install clip nuts to trap over
holes provided. Attach cover with two #10 - 24 x 1/2
fasteners.
2. Position the container under the grease drain so the
drain spout enters the cover approximately 1-1/2 to
2 in.
(38-51 mm)
.
3. Locate and mark the container mounting holes on the
extended base or roof curb.
4. Drill 3/16 in. (
5 mm
) diameter holes in marked locations.
5. Apply container with #10 - 24 x 3/4 fasteners.
6. For most climates, fill container with water (at
installation and after each cleaning) until it flows out the
drain hole. The unit is now ready for use.
Maintenance
Regular inspection of grease trap is recommended.
Depending on the amount of grease discharged through
the fan, the grease trap should be changed accordingly to
ensure proper operation.
Roof Curb
Grease
Trap
Grease
Trap
Welded duct
by others.
Minimum of
18 inches
(457 mm)
above roof
deck per
NFPA.
Roof Deck
Typical Commercial Kitchen Installation
