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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.