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The concentric vent allows both the intake for combustion air and the exhaust vent to pass-through a standard roof or sidewall. This is an alternative to the standard two pipe intake and vent shown in the basic furnace installation instructions. One termination for both intake and exhaust.
Noritz® PVC - 3CT Concentric Horizontal Termination Kit, 3 in, PVC, 48.1 in H x 8.75 in W x 8.75 in D