Install Instructions

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VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued)

Figure 7.12: Snorkel Terminal Conguration (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 Part 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, Polyue 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, Polyue 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

4" vent kit or can be fabricated from 1/2" stainless steel mesh screen. Rodent screens (“bird guards”) for PolyPro, Polyue

and InnoFlue are as follows:

Size/Vent System Rodent Screen (“Bird Guard”)

3" PolyPro DuraVent # 3PPS-BG

4" Poly Pro DuraVent # 4PPS-BG

3" Polyue Selkirk # 3PF-HVST

4" Polyue Selkirk # 4PF-HVST

3" InnoFlue Centrotherm # IASPP03

4" InnoFlue Centrotherm # IASPP04

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 ashing 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

196021 4 x 36" PVC

197021 4 x 36" CPVC

See Part VII-E of this manual and the Ipex instructions provided with the terminal, for installation details.