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ACCESSORIES
EVAPORATOR RETURN AIR PLENUM
Evaporator return air plenums are available for installations where it is required to duct air to
the inlet of the evaporator. The evaporator return air plenums allow the user to connect
round ducts (flexible or rigid) to the return air intake to reduce air noise and increase the
number of options for solving difficult cooling problems. The plenum attaches to the front of
the unit, replacing the return air grille. Refer to the table below for configuration and
application information
DEP-10 for PAC12 transitions the return air opening to 10-inch round duct.
2DEP-12 for PAC18 and PAC24 transitions the return opening to a 12-inch round duct.
DEP-16 for PAC36 and PAC60 transitions the return opening to a 16-inch round duct.
NOTE—When a DEP is installed, it is recommended to set the evaporator blower
speed to high, to avoid evaporator coil freeze-up.
FILTER(S)
DEP—EVAPORATOR
RETURN AIR PLENUM
13
Plenum Kit
Duct/
Flange
PAC12 PAC18 PAC24 PAC36 PAC60 FILTERS
DEP-10
10 inch
✓
(1) 10 x 20 x 1”
2DEP-12
12 inch
✓ ✓
(1) 16 x 24 x 1”
DEP-16
16 inch
✓ ✓
(1) 10 x 30 x 1”
(1) 12 x 30 x 1”
Maximum
Equivalent
Feet
25 50 60 70 80
Est. External
Static
Pressure
(.20) (.25) (.25) (.25) (.50)
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