Burnham K2WTC, Installation, Operating And Service Instructions

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VII. Venting
C. Design Requirements Unique to Vertical Venting Systems (continued)
Figure 7.12: Snorkel Terminal Configuration (CPVC/PVC Vent Systems Only)
C. Design Requirements Unique to Vertical Venting Systems
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 5-8) – 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 (not supplied) is generally recommended for both terminations. These can be fabricated from 2 x 2
(1/2” mesh) stainless steel screen. Rodent screens and are installed as shown in Figure 7.29. Rodent screens (“bird guards”)
for PolyPro, InnoFlue and Polyflue are as follows:
Size/Vent System Rodent Screen (“Bird Guard”)
3” PolyPro DuraVent # 3PPS-BG
3” Polyflue Selkirk # 3PV-HVST
3” InnoFlue Centrotherm # IASPP03
Terminal Option I: Ipex FGV Concentric Terminal (Acceptable for Vent Option 5) - 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 FGV Concentric Terminal Description
196006 3 x 20” PVC
196106 3 x 32” PVC
196116 3 x 44” PVC
197107 3 x 32” CPVC
197117 3 x 44” CPVC
See Section VII - E of this manual and the Ipex instructions provided with the terminal, for installation details.