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I-SCE (09-18) PN207697R9
Specific Venting Requirements: Concentric Adapter Box Pipe Connections
NOTE: Do NOT make actual connections until after reading the instructions and length require-
ments for installing the vent/combustion air kit. The connection requirements are the same for
both vertical and horizontal systems, but the length of the double-wall pipe will vary.
When pipe diameters differ, depending on direction of airflow, join the pipes with either a tapered reducer or enlarger
as shown in Figure 11.
Figure 11. Concentric Adapter Box Connections
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