20
C
U
T
H
E
R
E
Vent/Flue Pipe Cuts
Figure 11
1. Remove screws from vent flange.
2. Remove internal elbow and vent pipe.
3. Cut pipe 2 1/2” from flange.
4. Remove cabinet plug adjacent to inducer outlet and
install an original cabinet vent hole.
5. Install RF000142 coupling on inducer outlet.
6. Install flanged vent section removed in step 2 &
secure with clamps.
7. Secure flange to cabinet using screws removed in
step 1.
A
LTERNATE
C
OMBUSTION
A
IR
P
ROVISION
(Upflow / Horizontal models only)
When using the alternate venting location, either in a
horizontal left side down installation or a vertical instal-
lation using down – venting, an alternate combustion air
opening can used. A locating dimple is located on the
right side of the furnace cabinet. The locating dimple is 1
7/8" measured from the front edge of the cabinet in line
with the knock out. To use the alternate combustion air
location:
1. Remove screws and combustion air flange from
cabinet.
2. Insert cabinet plug in unused combustion air hole.
3. Drill a pilot hole at the cabinet dimple (size dictated
by knockout tool used).
4. Use a knockout tool to create a 3" diameter hole
5. Install combustion air flange and secure with screws
removed in step one.
V
ENT
/F
LUE
P
IPE
L
ENGTHS
AND
D
IAMETERS
For installations at or above 7,000 feet altitude, use 3”
venting. Refer to the following table for applicable length,
elbows, and pipe diameter for construction of the vent/flue
pipe system. The tee used in the vent/flue termination must
be counted as an elbow when determining the number of
elbows in the piping system.
Figure 12
Floo
r
Use alternate vent
& combination air locations
DOWN VENTING UPFLOW MODEL FURNACES ONLY
Base
men
t / Cr
awls
pace
Condensate trapped
to prevent flue gas from escaping
and routed to field supplied
condensate disposal
Combustion Air Pipe
Vent Pipe
All piping and fittings must be joined per material manufacturer’s specifications
to prevent separation and flue gas leaks.
Both Pipes Terminated
Outside Structure
1/4” per foot min. slope
6’ MAX.
Field Supplied
Drain Tee on Vent Pipe
