Burnham K2WTC - Design Requirements Unique to Vertical Venting Systems

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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 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,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 (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Polyueareasfollows:
Size/Vent System Rodent Screen (“Bird Guard”)
3” PolyPro DuraVent # 3PPS-BG
   3”Polyue  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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
See Section VII - E of this manual and the Ipex instructions provided with the terminal, for installation details.