AHRI K2WT, 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 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 suitable for 3” PVC terminals
are supplied with the boiler and are installed as shown in Figure 7.29. If 2” CPVC is used, these screens can be cut to fit into
the smaller fittings. Rodent screens (“bird guards”) for PolyPro, Polyflue and InnoFlue are as follows:
Size/Vent System Rodent Screen (“Bird Guard”)
2” PolyPro DuraVent # 2PPS-BG
3” PolyPro DuraVent # 3PPS-BG
2” Polyflue Selkirk # 2PF-HVST
3” Polyflue Selkirk # 3PV-HVST
2” InnoFlue Centrotherm # IASPP02
3” InnoFlue Centrotherm # IASPP03
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 FGV Concentric Terminal Description
196005 2 x 16” PVC
196105 2 x 28” PVC
196125 2 x 40” PVC
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.