Velocity Shadow Series, Installation And Operating Instructions Manual

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C. Design Requirements Unique to Vertical Venting Systems
Table 7.11 summarizes all vertical twin pipe vent options. In addition to the requirements in Part VII-A, observe the
following design requirements:
1. Permitted Terminals for Vertical Venting
Terminal Option H: Fittings – Vent terminates in a plain end (coupling for PVC. 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 7.12 and 7.13.
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. They are installed as shown in Figure 7.18.
Terminal Option I: Ipex FGV Concentric Terminal - This terminal is shown in Figure 7.13 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 Part VII-E of this manual and the Ipex instructions provided with the terminal, for installation details.
Terminal Option J: Diversitech Concentric Terminal - This terminal is shown in Figure 7.13 and may be used with CPVC/
PVC vent systems. See Part VII-E of this manual and the Diversitech instructions provided with the terminal, for installation
details.
2. Vertical Vent and Air Intake Location – Observe the following clearances from roof mounted terminals:
• Bottom of air intake opening must be at least 12” above the normal snow line anticipated on the roof.
• Exhaust opening must be at least 2ft above any portion of the roof or structure located within horizontally within 10ft.
• For terminal option H, maintain at least 12” of vertical separation between the exhaust and intake opening as shown in
Figure 7.12.
NOTICE
Vertical venting and combustion air roof penetrations (where applicable) require the use of roof
flashing and storm collar, which are not supplied with the boiler, to prevent moisture from entering the
structure.