SUPPLY AIR CONNECTIONS
For a furnace not equipped with a cooling coil, the outlet duct shall
be provided with a removable access panel. This opening shall be
accessible when the furnace is installed and shall be of such a size
that the heat exchanger can be viewed for possible openings using
light assistance or a probe can be inserted for sampling the air
stream. The cover attachment shall prevent leaks.
Upflow and Horizontal Furnaces
Connect supply-air duct to flange on furnace supply-air outlet.
Bend flange upward to 90° with wide duct pliers. The supply-air
duct attachment must ONLY be connected to furnace supply-
outlet-air duct flanges or air conditioning coil casing (when used).
DO NOT cut main furnace casing to attach supply side air duct,
humidifier, or other accessories. All accessories MUST be con-
nected external to furnace main casing.
Installation tip: For horizontal applications, the top most flange
may be bent past 90 degrees to allow the evaporator coil to hang
on the flange temporarily while the remaining attachment and
sealing of the coil are performed.
Downflow Furnaces
Connect supply-air duct to supply-air opening on furnace. The
supply-air duct attachment must ONLY be connected to furnace
Fig. 16—Horizontal Suspension with Straps
A02014
Fig. 17—Typical Attic Installation
A02164
30-IN. MIN
WORK AREA
6
″
MIN*
TYPE-B
VENT
17
3
/
4
″
22
″
SHEET
METAL
SEDIMENT
TRAP
MANUAL SHUTOFF
GAS VALVE
LINE CONTACT ONLY PERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE TOP AND TWO SIDES OF THE FURNACE
JACKET AND BUILDING JOISTS,
STUDS, OR FRAMING.
GAS
ENTRY
17
3
/
4
″
OVER ALL
4
3
/
4
″
UNDER DOOR
1
″
UNDER FURNACE
EXTEND OUT 12
″
OUT
FROM FACE OF DOOR
* WHEN USED WITH
SINGLE WALL VENT
CONNECTIONS
13
→