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FIGURE 2.3: TYPICAL CLOSET/UTILITY ROOM INSTALLATION
FIGURE 2.4: TYPICAL CLOSET INSTALLATION
STEP 2: CUTTING RETURN AIR OPENING
Select the exact location for the return air box. Avoid
installing the box in the dining room, living room, kitchen,
etc., unless the return air duct can be installed with at
least two 90° bends (accomplished by joining two return
air ducts together).
SpacePak optionally supplies Direct Mount Filter Box
Models SPC-3B for ESP-2430JV, SPC-4B for ESP-
3642JV and SPC-5B for ESP-4860JV units. A direct-
mount filter box may be installed directly to the unit (see
Figure 2.4).
Cut the rough opening for the return air box 14-1/2" wide
by the "A" dimension (Figure 2.5) of appropriate unit size.
These openings will accomodate the return air box with
sufficient frame lip to cover the opening (See Figure 2.5).
Where joists are 16" on center, the return air box should
fit between successive joists. Where joists run in the
opposite direction, or to properly center the return, it may
be necessary to cut joists and install headers.
For wall return applications, cut the return air opening to
accommodate the return air box. Do not place the
opening on a straight path to the return air panel. Locate
the opening at a different height or at a right angle to the
return air panel as shown in Figure 2.3. Alternately, units
can be installed without the return air duct as long as the
return air is being freely pulled from the conditioned
space and filtered before the return air opening.
Check the opening for the proper fit of the return air box.
Do not install the return air box until the unit is fully
installed if the hole is required to get material or
equipment to the installation location.
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