Page 4
Installer’s Information Manual
GAS
INPUT*
MOTOR
SIZE*
FURNACE
WIDTH**
RETURN AIR
SIZE**
SUPPLY AIR
SIZE**
CLEARANCE TO COMBUSTIBLES***
(INCHES)
VENT SIZE
(Btu/hr)
(HP)
“A”
“B”
“C”
TOP
SIDES
BACK
FRONT
VENT
(INCHES)
54,000
1/3
17 1/2
15 3/4”
15 15/16”
1
0
0
2
0
2
72,000
1/2
17 1/2
15 3/4”
15 15/16”
1
0
0
2
0
2 OR 3
72,000
3/4
20 1/2
18 3/4”
18 15/16”
1
0
0
2
0
2 OR 3
90,000
1/2
17 1/2
15 3/4”
15 15/16”
1
0
0
2
0
2 OR 3
90,000
3/4
20 1/2
18 3/4”
18 15/16”
1
0
0
2
0
2 OR 3
108,000
3/4
23 1/2
21 3/4”
21 15/16”
1
0
0
2
0
3
126,000
3/4
23 1/2
21 3/4”
21 15/16”
1
0
0
2
0
3
* See Furnace Rating Plate located on blower door.
** These are furnace dimensions. See Sections 9 and 10 for proper ductwork and floor opening dimensions.
*** Certified for installation on wood flooring. 30-inch front clearance required for service. 18-inch front clearance required in an alcove.
Figure 1. Furnace Dimensions and Clearances.
