Duct opening sizes
Model A(mm) B(mm)
009-012 450 332
015-024 521 381
030-036 572 432
042-060 675 482
Installation and checklist
Return duct opening panel
A return duct opening frame is added
to the return opening for horizontal unit
to alternate between direct air return
and air return from the return duct. In
lieu of filter rack, duct opening panel
can be equally sealed. Duct flange is
used for field piping ease, as shown in
Figure 8.
Figure 7 Duct Opening Frame Diagram
DUCT PANEL
with 1 1/2”-FLANGE
1”
Unit Top
A
Unit Tap
Unit Side
Unit Side
3 3/4”
B
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