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VII Venting
A. General Vent System Design
Therearevebasicwaystoventthisboiler:
• Horizontal (“Side Wall”) Twin Pipe Venting (Figure 7.0a) - Vent system exits the building through an outside wall.
Combustionairanduegasareroutedbetweentheboilerandtheterminal(s)usingseparatepipesforatleastpartofthe
way. A summary of Horizontal Twin Pipe venting options is shown in Table 7.5.
• Vertical Twin Pipe Venting (Figure 7.0b)-Ventsystemexitsthebuildingthrougharoof.Combustionairanduegas
are routed between the boiler and the terminal(s) using separate pipes for at least part of the way. A summary of Vertical
Twin Pipe venting options is shown in Table 7.13
• Split Venting (Figure 7.0c) - Exhaust system exits the building through a roof, and combustion air is drawn from a
terminal mounted on the side wall. A summary of split venting options is shown in Table 7.21
• Horizontal (“Side Wall”) Concentric Venting (Figure 7.0d) – The entire vent system is concentric from the boiler to
the termination on the wall. The venting components used in this system are available through Crown distributors.
Installation instructions for this system are covered in a separate vent supplement (Crown PN 980137).
• Vertical Concentric Venting (Figure 7.0e) – The entire vent system is concentric from the boiler to the termination on
the roof. The venting components used in this system are available through Crown distributors. Installation instructions
for this system are covered in a separate vent supplement (Crown PN 980137).
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