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Figure 16. Horizontal Venting
* These neoprene couplings are fi eld-supplied and can be used if the installation requires breakable connections in the piping.
Note that a maximum of two couplings per pipe are allowed.
Upfl ow Furnaces
Downfl ow Furnaces
**NOTES
1. Subtract 2.5 ft. for each additional 2” long radius elbow, 5 ft. for each additional 2” short radius elbow, 3.5’
for each additional 3” long radius elbow, and 7’ for each additional 3” short radius elbow.
2. Two 45 degree elbows are equivalent to one 90 degree elbow.
3. Do not include termination elbows in calculation of vent length
4. This table is applicable for elevations from sea level to 2000 ft. For higher elevations decrease vent pipe
lengths by 8% per 1000 ft. of altitude.
5. Only the above pipe materials are approved for use with these condensing furnaces.
Table 5. Vent Table
5/8"
Inlet
Exhaust
Combustion
Offset with
Exhaust Pipe
for Adequate
Dimensional
Clearance
PVC or
ABS Pipe
See Vent Table 5
Straps or Other Suitable
Supports at Minimum of 5 ft. Intervals
Upward Pitch - 1/4" per Foot
Outlet Exhaust Vent
First Support Placed
as Close to Furnace
Connection as Possible
Exhaust Vent
Wall
Seal/Caulk
around Pip
e
at Building
90˚ Elbow
12" Min.
Normal Snow Level
7"
Straight Neoprene Coupling
with 2 Hose Clamps*
(Optional - Not Shown)
5/8"
Inlet
Exhaust
Combustion Air
Inlet
Offset with Exhaust
Pipe for Adequate
Dimensional
Clearance
PVC or
ABS Pipe
See Vent Table 5
Straps or Other Suitable
Supports at Minimum of 5 ft. Intervals
Upward Pitch - 1/4" per Foot
Outlet Exhaust Vent
First Support Placed
as Close to Furnace
Connection as Possible
Exhaust Vent
Wall
Seal/Caulk
around Pipe
at Building
90˚ Elbow
12" Min.
Normal Snow Level
Straight Neoprene
Coupling with
2 Hose Clamps*
APPLICATION
SINGLE PIPE LENGTH (ft.)
with 1 long radius elbow*
DIRECT VENT, DUAL PIPE LENGTH (ft.)
with 1 long radius elbow on each pipe*
PVC,CPVC or ABS Outlet Outlet Inlet/Outlet Inlet/Outlet Inlet/Outlet
SCH. 40 Pipe Size 2” 3” 2” 2” 3” 2” 3” 3”
Models 040
80 150 40 40 50 50 90 90
Models 060 & 080 60 150 30 30 35 35 90 90
Models 100 & 120 30 150 15 15 25 25 90 90