6A93086CONCENTRICVENTA concentric vent kit allowsvent and combustion-airpipes to terminate through asingle exit in a roof or sidewall.One pipe runs inside the otherallowing venting through theinner pipe and combustion airto be drawn in through the out-er pipe.A88202DOWNFLOWSUBBASEOne base fits all furnacesizes. The base is designedto be installed between thefurnace and a combustiblefloor when no coil box is usedor when a coil box other thana Carrier cased coil is used. Itis A.G.A. design certified foruse with Carrier 58MVP fur-naces when installed indownflow applications.