6
Power Exhaust Installation for Horizontal Return
Air Applications
Use the following instructions for horizontal return air duct appli
-
cations of the power exhaust fan assembly. (See Fig. 10.)
1. A transition in the duct height is required. To assure that the
transition required will accommodate the exhaust opening
size begin at least 5 ft away from the back of the outside air
hood. Provide a 42.5 in. W x 23.2 in. H opening in the side of
the return air duct, as shown in Fig. 11.
NOTE: Any obstruction closer than 5 ft will interfere with
airflow and result in rain entering the hood through the filters.
2. Provide engagement holes (12) for 1/4-14 x 3/4 in. gasket
head screws (AL31AZ308) around the opening as shown in
Fig. 11.
3. Apply silicone caulking to corners and back side of mating
flanges of the power exhaust fan assembly.
4. Set the power exhaust hood assembly into the opening in the
duct, bottom lip first as shown in Fig. 12.
5. Lift the assembly to allow the bottom corner tabs to hook
over the opening in the duct work. (See Fig. 12.)
Fig. 10 — Typical Horizontal Air Return Application
Fig. 11 — Horizontal Discharge Mounting Opening
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing, safety glasses and gloves
when handling parts and servicing air conditioning equipment.
Outdoor Air
Hood
Field Supplied
Return Duct
Power Exhaust
5 in. Min.
Clearance
5 ft. Minimum
0.62
23.12
0.95
0.99
42.50
2 x 10.25 (= 2 0 .50)
0.46
0.99
9.25
2 x 12.00 (= 2 4.00)
Engagement holes for
1/4-14 x 3/4 in. gasket head screws
(12 places)
