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Figure 21. Rain Cap to Small Vent Pipe Assembly
5. Install concentric Y fitting and pipe assembly through the structure’s hole and field-supplied roof boot/flashing.
Do not allow insulation or other materials to accumulate inside pipe assembly when installing through the hole.
6. Secure assembly to roof structure as shown in Figure 22 using field-supplied metal strapping or equivalent
support material.
NOTICE
Ensure termination height is above the roof surface or anticipated snow level. See Figure 22.
If assembly is too short to meet height requirements, the two pipes supplied in the kit may be
replaced by using the same diameter pipe. DO NOT extend the overall dimension by more
than 60 inches (152.4 cm). See Figure 19.
Figure 22. Concentric Vent Roof Top Attachment
7. Install rain cap and small diameter pipe assembly in roof penetration assembly. Ensure small diameter pipe is
cemented and bottomed in Y concentric fitting.
8. Cement heater combustion-air and vent pipes to concentric Y fitting assembly (Figure 20). See Figure 22 for
proper pipe attachment.
9. Operate heater through one cycle to ensure combustion-air and vent pipes are properly connected and sealed
to concentric vent termination connections.