Design Requirements Unique To Vertical Venting Systems - Burnham K2WT Residential Installation, Operating And Service Instructions

VII. Venting
C. Design Requirements Unique to Vertical Venting Systems (continued)
Figure 7.12: Snorkel Terminal Configuration (CPVC/PVC Vent Systems Only)
Table 7.13a summarizes all vertical twin pipe vent options. Table 7.13.b summarizes vent options in which an
abandoned B-vent chimney is used both as a chase for the vent pipe and as a conduit for combustion air.
In addition to the requirements in Section VII - A, observe the following design requirements:
1. Permitted Terminals for Vertical Venting
Terminal Option H: Fittings (Acceptable for Vent Options 10-17) – Vent terminates in a plain end (coupling for
PVC, bell end for PolyPro, Polyflue and plain end pipe for InnoFlue). Intake terminates in a PVC 180 elbow
pointing down (two sweep 90's may be substituted). Observe the clearances from the roof, and normal snow line
on the roof, shown in Figures 7.15 and 7.17. The section of PolyPro, Polyflue or InnoFlue exposed to the outdoors
must be UV resistant.
Use of rodent screens is generally recommended for both terminations. Two rodent screens are included within
the available 2" and 3" vent kits or can be fabricated from 1/2" stainless steel mesh screen. Rodent screens and
are installed as shown in Figure 7.29. Rodent screens ("bird guards") for PolyPro, Polyflue and InnoFlue are as
follows:
Size/Vent System
2" PolyPro
3" PolyPro
2" Polyflue
3" Polyflue
2" InnoFlue
3" InnoFlue
Terminal Option I: Ipex FGV Concentric Terminal (Acceptable for Vent Options 10 & 11) - This terminal is shown
in Figure 7.16 and may be used with CPVC/PVC vent systems. Use a compatible roof flashing and storm collar
in accordance with the Ipex instructions for this terminal. This terminal is available in various lengths and in both
PVC and CPVC. Terminals acceptable for use with these vent options are as follows:
Ipex PN
196005
196105
196125
196006
196106
196116
197107
197117
See Section VII - E of this manual and the Ipex instructions provided with the terminal, for installation details.
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C. Design Requirements Unique to Vertical Venting Systems
Rodent Screen ("Bird Guard")
DuraVent # 2PPS-BG
DuraVent # 3PPS-BG
Selkirk # 2PF-HVST
Selkirk # 3PF-HVST
Centrotherm # IASPP02
Centrotherm # IASPP03
FGV Concentric Terminal Description
2 x 16" PVC
2 x 28" PVC
2 x 40" PVC
3 x 20" PVC
3 x 32" PVC
3 x 44" PVC
3 x 32" CPVC
3 x 44" CPVC
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