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EQUIPMENT IN CONFINED SPACE - 
ALL AIR FROM OUTSIDE
OUTLET AIR
INLET AIR
NOTE-Each air duct opening shall have a free area of at least one
square inch per 2,000 Btu (645mm
2
 
per .59kW) per hour of the total
input rating of all equipment in the enclosure. If the equipment room
cate directly with the outdoors, each opening shall have a free area
of at least 1 square inch per 4,000 Btu (645mm
2
 
per 1.17kW) per
hour of the total input rating of all other equipment in the enclosure.
ROOF TERMINATED 
EXHAUST PIPE
SIDE WALL
 TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
FURNACE
FIGURE 9 
Shipping Bolt Removal
Units with 1/2 hp blower motor are equipped with three 
exible legs  and one  rigid leg. The rigid  leg is  equipped 
with a shipping bolt and a at white plastic washer (rather 
than  the  rubber  mounting  grommet  used  with  a  exible 
mounting leg). See FIGURE 10. The bolt and washer 
must be removed before the furnace is placed into 
operation. After the bolt and washer have been removed, 
the rigid leg will not touch the blower housing.
RIGID LEG
remove shipping bolt and washe
UNITS  WITH 1/2 HP
BLOWER MOTOR
FIGURE 10 
Installation - Setting Equipment
 WARNING
Do not install the furnace on its front, back or in the 
horizontal position. See FIGURE 12. Do not connect 
the return air ducts to the back of the furnace. Doing so 
will adversely  aect the operation  of the safety  control 
devices, which could result in personal injury or death.
Select a location that allows for the required clearances 
that are listed on the unit nameplate. Also consider gas 
supply connections, electrical supply, vent connection, 
condensate trap and drain connections, and installation 
and service clearances [24 inches (610 mm) at unit front]. 
The unit must be level from side to side. Unit may be 
positioned from level to 1/2” toward the front to aid in 
draining. See FIGURE 11.
Allow for clearances to combustible materials as indicated 
on the unit nameplate. Minimum clearances for closet or 
alcove installations are shown in gure 13.
 WARNING
Blower access panel must be securely in place when 
blower and burners are operating. Gas fumes, which 
could contain carbon monoxide, can be drawn into living 
space resulting in personal injury or death.
FRONT VIEW SIDE VIEW
AIR FLOW
AIR FLOW
AIR FLOW
SIDE VIEW
Unit must be level side-to-side. Unit may be positioned
from level to 1/2” toward the front to aid in draining.
FIGURE 11