506303-01 Page 7 of 40Issue 0938
When making ABS joints, pieces can be prepared with a clean
dry cloth to clean inside socket surface of fitting and male
end of pipe to depth of socket. Refer to procedure specified
in ASTM D3138. When joining ABS to PVC materials, use
transition solvent.
Preferred fittings are DWV style or long sweep. Seal all joints
gas tight with appropriate cement. In areas where vent and
air intake pipes are exposed to abnormal stress or are subject
to damage, schedule 80 pipe should be used.
Category IV Furnace Limitations
This furnace shall not be connected to any Type B, BW, or L
vent or vent connector and shall not be connected to any portion
of a factory-built or masonry chimney. This furnace is not to
be common vented with any other appliance. The vent
pipe must not be connected to a chimney flue serving a
separate appliance designed to burn solid fuel.
Table 2
Piping and Fitting Specifications
D1785
Schedule 40 PVC
(Cellular Core Pipe)
F891
Schedule 40 PVC
(Fittings)
D2466
SDR-26
(Pipe)
D2241
Schedule 40 ABS
(Pipe)
D1527
Schedule 40 ABS
(Fittings)
D2468
Schedule 40 & 80 CPVC
(Pipe)
F441
ABS-DWV
Drain Waste & Vent
(Pipe & Fittings)
D2661
PVC-DWV
Drain Waste & Vent
(Pipe & Fittings)
D2665
Piping & Fitting
Material
ASTM
Specification
Schedule 40 PVC (Pipe)
SDR - 26 CPVC (Pipe) F442
Schedule 40 ABS
Cellular Core DWV
(Pipe)
F628
Schedule 40 & 80 CPVC
(Fittings)
F438
Figure 4
Vent Tables *
(numbers in inches unless specified otherwise)
Minimum Pipe Diameter
40,000 – 60,000 BTU/HR Models
NR = Not Recommended
Minimum Pipe Diameter
125,000 BTU/HR Models
Minimum Pipe Diameter
80,000 – 100,000 BTU/HR Models
* 2” not recommended at altitude above 4,000 ft.
3” required for altitude above 5,000 ft.
0123456789
222222222
2222222
2
3333
33333
Vent Pipe
Length
(ft.)
Number of 90° Elbows
5
10
20
30
40
50
60
70
80
90
1.5
1.5
1.5
22222
2
22
2.5
2
222222
2
2
2.5 2.5
2.5
2.5
2.5
2.5
2.5 2.5
22 2
2
2
32.5 2.5
2.5 2.5 2.5 2.5
2.5
3
3
3
2.5
2
2
2.5 2.5
2.5 2.5
2.5
2.52.52.5
2.52.5
2.5
2.5
2.5
2.52.5
3
3
33
3
NR
NR NR
NR
NR
NR
0123456789
222
2
22
222 333
3
33333
3333
33
Vent Pipe
Length
(ft.)
Number of 90° Elbows
5
10
20
30
40
50
60
70
80
90
3
3
33
3
3 3
3
3
3
3
3 3
3
33
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5 2.5 2.5 2.5
2.5 2.5 2.5 2.5
2.5 2.5
2.5
2.5
2.5
2.5
2.5
NR
NR
NR
2
NR
2
2
2
2
22
22222
2
2
NR NR NR
NR
NR
NR NR
NR
NR
NR
NRNR
NR
NR NR NR
NR
NR
NR
NR
NR
0123456789
.
3
33
Vent Pipe
Length
(ft.)
Number of 90° Elbows
5
10
20
30
40
50
60
NR
2.5
3
3
33
3
3
3
NR
NR
NR
NR
NR
NR
NR NR
NR
NR
NR
NR
NR
NRNR
NR
NR
NR
NR NR NR
NR
NR
2.5
2.5 2.5
2.5
2.5
2.5 2.5
2.5
2.5 2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.52.52.5
2.5
2.5
2.5
2.5 2.5
2.5
2.52.5
2.52.52.5
2.5
2.5
2.52.5
Figure 3
Concentric Vent Kit Dimensions
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