Velocity Shadow Series, Installation And Operating Instructions Manual

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FIGURE 7.0 BASIC VENT OPTIONS
FIGURE 7.0a: HORIZONTAL TWIN PIPE
FIGURE 7.0b: VERTICAL TWIN PIPE FIGURE 7.0c: SPLIT VENTING
All of these systems are considered “direct vent” because the air for combustion is drawn directly from the outdoors into the
boiler. One of the vent option columns in Tables 7.5, 7.11 or 7.15 must match the planned vent and air intake system exactly.
Design details applying to all vent systems are shown in this section. Observe all design requirements in this section, as well as
those unique to the type of system being installed:
• B – Design Requirements Unique to Horizontal Twin Pipe Vent Systems
• C - Design Requirements Unique to Vertical Twin Pipe Vent systems
• D- Design Requirements Unique to Split Vent Systems
1. Approved Vent Systems and Materials – The following materials and vent systems may be used to vent this boiler:
• CPVC – Use only CPVC listed to ASTM F441. In Canada, this pipe must also be listed to ULC S636.
• PVC – PVC may be used only as permitted in this manual. All PVC must be listed to ASTM D2665. At least 30” of
CPVC pipe, and at least one CPVC elbow, must be installed between the boiler’s vent connection and the PVC pipe. Use
of foam core PVC is not permitted for venting. PVC vent pipe may not be used to vent this boiler in Canada.
Use PVC and/or CPVC for the air intake system. PVC may be used for all air intake piping between the intake terminal and
the boiler.