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KNOB A
SHEET METAL
PLATE
CUT OPENING IN
RETURN DUCT
RETURN
DUCT
SHEET METAL
PLATE
RETURN DUCT
BASE PLATE D
COVER B
HUMIDISTAT SWITCH C
GASKET G
SCREW H (x4)
INSIDE OF
RETURN
DUCT
Figure 3 – Fiber Board Duct Mount
90-1230
Aprilaire 4655 Dehumidifier User Manual