Burnham K2WTC Installation, Operating And Service Instructions page 23

VII. Venting
B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued)
Vent Option
Illustrated in Figure
Pipe
Penetration
through
Structure
Material
Nominal
Diameter
Min Equivalent Vent Length:
Models
Max Equivalent Vent Length (Note 1):
Models
Terminal
Option A
(Fittings)
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 135ft of vent pipe and also up to
135 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.
107774-01- 9/17
Table 7.5: Summary of Horizontal Twin Pipe Venting Options
Vent
Intake
Vent
Intake
Vent
Intake
135
150
180
135
150
180
Vent
Intake
1 2
7.6, 7.7,
7.9, 7.10
7.8
Wall Wall
Wall Wall
CPVC/ DuraVent
PVC PolyPro
(Note 2) (Rigid)
PVC PVC
3" 3"
3" 3"
12" 12"
52" 52"
52" 52"
135ft 135ft
135ft 135ft
135ft 135ft
3PPS-12B 3PF-10UV
Coupling
or
w/screen
3PPS-36B 3PF-39UV
(Note 3)
w/screen
Elbow
Elbow
w/screen
w/screen
(Note 3)
Ipex
Not Permitted
#196985
HVENT-3 Not Permitted
Ipex
Not Permitted
196006
CVENT-3 Not Permitted
Not
3PPS-HK
Permitted
3 4
7.9 7.9
Wall Wall
Wall Wall
Centro-
Selkirk therm
Polyflue InnoFlue
SW
PVC PVC
3" 3"
3" 3"
12" 12"
52" 52"
52" 52"
135ft 135ft
135ft 135ft
135ft 135ft
ISEP03 or
or ISEP0339
w/screen
w/screen
Elbow Elbow
w/screen w/screen
Not Permitted
23