Includes all the components necessary to line a chimney from chimney termination to base support excluding 3 in or 4 in Flex. 3 in or 4 in Flex, rigid vent lengths, elbows, and adaptors required to connect chimney kit base support to appliance and termination are sold separately. Centrotherm Eco Systems InnoFlue® Chimney Component Kit, Flex, 4 in Dia, Polypropylene, Domestic