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VII. Venting
B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued)
Table 7.5: Summary of Horizontal Twin Pipe Venting Options
Vent Option
Illustrated in Figure
Pipe
Vent
Penetration
through
Intake
Structure
Vent
Material
Intake
Vent
Nominal
Diameter
Intake
Min Equivalent Vent Length:
080
100
120
Models
150
180
Max Equivalent Vent Length (Note 1):
080
100
Models
120
150
180
Vent
Terminal
Option A
(Fittings)
Intake
Terminal Option B
(Ipex Low Profile)
Terminal Option C
(DiversiTech HVENT)
Terminal Option D
(Ipex FGV Concentric)
Terminal Option E
(DiversiTech CVENT)
Terminal Option F
(DuraVent Horizontal
Concentric)
Notes:
1. Max vent lengths shown also apply to the intake. For example, Vent Option #1 may have up to 60ft of vent pipe and also up
to 60 ft of intake pipe.
2. First 30" of vent and vent Elbow connected to boiler must be CPVC. Downstream vent pipe can be PVC except as noted in
text.
3. PVC Terminal coupling and inlet elbow may be offset on snorkels as shown in Figure 7.12.
107672-03 - 5/18
1
2
7.6, 7.7,
7.6, 7.7,
7.9, 7.10
7.8
7.8
Wall
Wall
Wall
Wall
CPVC/
CPVC/
DuraVent
PVC
PVC
(Note 2)
(Note 2)
PVC
PVC
2"
3"
2"
3"
12"
12"
12"
12"
12"
Not
52"
Permitted
Permitted
52"
60ft
135ft
60ft
135ft
135ft
Not
135ft
Permitted
Permitted
135ft
2PPS-12B
Coupling
Coupling
w/screen
w/screen
2PPS-36B
(Note 3)
(Note 3)
w/screen
Elbow
Elbow
w/screen
w/screen
w/screen
(Note 3)
(Note 3)
Ipex #
Ipex
196984
#196985
Permitted
HVENT-2
HVENT-3
Permitted
Ipex
Ipex
196105
196006
Permitted
CVENT-2
CVENT-3
Permitted
Not
Not
2PPS-HK
Permitted
Permitted
3
4
7.9, 7.10
Wall
Wall
Wall
Wall
DuraVent
PolyPro
PolyPro
Polyflue
(Rigid)
(Rigid)
PVC
PVC
2"
3"
2"
3"
12"
12"
12"
12"
12"
Not
52"
Permitted
52"
60ft
135ft
60ft
135ft
135ft
Not
135ft
Permitted
135ft
3PPS-12B
2PF-10UV
or
or
3PPS-36B
2PF-39UV
w/screen
w/screen
Elbow
Elbow
w/screen
w/screen
Not
Not
Permitted
Permitted
Not
Not
Permitted
Permitted
Not
Not
Permitted
Permitted
Not
Not
Permitted
Permitted
3PPS-HK
Permitted
5
6
7.9
7.9
Wall
Wall
Wall
Wall
Centro-
Selkirk
Selkirk
therm
Polyflue
InnoFlue
PVC
PVC
2"
3"
2"
3"
12"
12"
12"
12"
12"
Not
52"
Permitted
52"
60ft
135ft
60ft
135ft
135ft
Not
135ft
Permitted
135ft
3PF-10UV
ISEP02 or
or
or
ISEP0239
3PF-39UV
w/screen
w/screen
Elbow
Elbow
Elbow
w/screen
w/screen
Not
Not
Permitted
Permitted
Not
Not
Permitted
Permitted
Not
Not
Permitted
Permitted
Not
Not
Permitted
Permitted
Not
Not
Permitted
Permitted
7
8
7.9
7.9
Wall
Wall
Wall
Wall
Centro-
therm
InnoFlue
SW
SW
PVC
PVC
2"
3"
2"
3"
12"
12"
12"
12"
12"
Not
52"
52"
60ft
135ft
60ft
135ft
135ft
Not
135ft
135ft
ISEP03 or
ISEP0339
w/screen
Elbow
w/screen
Not
Not
Permitted
Not
Not
Permitted
Not
Not
Permitted
Not
Not
Permitted
Not
Not
Permitted
21
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