Crown Boiler PHNTM080 - Design Requirements Unique to Vertical Venting Systems

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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 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tinto
thesmallerttings.Rodentscreens(“birdguards”)forPolyPro,PolyueandInnoFlueareasfollows:
Size/Vent System Rodent Screen (“Bird Guard”)
2” Polypro DuraVent # 2PPS-BG
3” Polypro DuraVent # 3PPS-BG
   2”Polyue  Selkirk#2PF-HVST
   3”Polyue  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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
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 Part VII-E of this manual and the Ipex instructions provided with the terminal, for installation details.
FIGURE 7.12: SNORKEL TERMINAL CONFIGURATION (CPVC/PVC VENT SYSTEMS ONLY)