Rinnai Zen Combi Boiler Standard Horizontal Flue Kit – ABFZ-01 Wall Terminal, Adaptor & Gaskets Standard horizontal flue termination kit for the Rinnai Zen combi boiler range. For installations where the flue terminates through an external wall. Includes wall terminal, flue adaptor (male/female) and wall gaskets. Part number ABFZ-01. Kit Contents Wall terminal Flue adaptor M/F Wall gaskets Ideal For Rinnai Zen combi boiler installations terminating horizontally through an external wall Standard horizontal flue runs — for longer flue runs or vertical terminations, additional flue components are required Standard horizontal flue kit for the Rinnai Zen combi boiler. Order today. Gas Safe registered engineer installation required.