3" PVC Concentric Vent Kit is for use with 3" intake/vent systems. 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/vent shown in the basic furnace installation instructions. Refer to the furnace installation instructions for intake/vent pipe sizing information.
NOTE: The Concentric Vent reduces the allowable intake/vent piping length by 5 feet from that listed in the basic furnace installation instructions. Do not use the Concentric Vent kit for anything other than a Category IV furnace
