Made from PPs-UV outer and PPs-UV inner, the concentric wall termination incorporates flue gas termination and combustion air intake. Use with InnoFlue® concentric or with InnoFlue® SW by adding an ICTC adaptor. Centrotherm Eco Systems InnoFlue® Concentric Wall Termination, 4 or 6 in Vent, Polypropylene, Domestic