Nordyne O4MD Installation, Operation And Maintenance Manual page 20

Table A-5 General Dimensions (Inches)
FURNACE
MODEL
Width
A
CABINET
Depth
B
Height
C
Diameter
H
PLENUM OPENINGS
Supply Air Return Air
DxE FxG
20-1/2 x 20-1/2 18 x 18
FLUE
Height
J2
AIR FILTER
J1
O4MD-
22-1/4 22-1/4 62 6 15 37-1/2 20 x 20 x 1
140A-16-F
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20 153B0801