8
STEP 2: CUTTING RETURN AIR OPENING
If joists are on 16" centers, the 14
1
/
2
" width of 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 all wall return applications, cut the return air opening
to accomodate the return air box according to the same
dimensions. Remember, location of opening must allow
for a 90° bend in the return air duct.
Check the opening for proper fit of the return air box. Do
not install the return air box until the installation of the
entire SpacePak system is completed, if you want to fit
materials up through this hole.
FIGURE 2.7: RETURN AIR BOX FRAME DIMENSIONS
14 Ft. MAXIMUM FLEXIBLE
2 Ft.
MAX.
FIGURE 2.6: VERTICAL AIR FLOW UNIT INSTALLATION
Select exact location for return air box. Avoid installing
box in dining room, living room, kitchen, etc., unless
return air duct can be installed with at least two 90°
bends (accomplished by splicing two return air ducts
together.)
For attic installations to raise fan coil unit up through
opening, cut return air opening 14
1
/
2
" wide by 27" long for
the ESP-2430G, 14
1
/
2
" wide by 31
1
/
2
" long for the ESP-
3642G* and 14
1
/
2
" wide by 36
1
/
2
" long for the ESP-4860G.
These openings will accomodate the return air box with
sufficient frame lip to cover the opening (see Figure 2.7).
*NOTICE: The return air panel must be removed from
the ESP-3642G unit to fit through hole cut out.
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