The Rinnai Ext. Kit 21"-40", part number FOT-220, is a factory venting accessory used to extend the approved vent run on compatible Rinnai EX-series direct vent wall furnaces. It is intended for installations where additional wall thickness or setback requires added vent length to reach the exterior termination point. The kit is designed to integrate with Rinnai’s matched intake/exhaust vent system so the appliance maintains a sealed direct-vent configuration when installed per Rinnai instructions.
This extension kit provides an adjustable extension range of 21" to 40" for compatible vent configurations. It is used as part of the vent assembly to help align the furnace flue/air connections through the wall while maintaining required clearances and proper sealing. Use only with the listed Rinnai models and approved Rinnai vent components, and follow all manufacturer limits for total vent length, orientation, and termination requirements.
What’s Included: One (1) Rinnai extension kit assembly providing 21"–40" extension capability, with manufacturer-supplied extension components and installation hardware as packaged.
Installation Limits: For use only with compatible Rinnai EX-series direct vent wall furnaces and approved Rinnai venting configurations; installation must follow Rinnai venting instructions, maximum vent-length limits, sealing requirements, and required clearances to combustibles.
Compatibility: Compatible with Rinnai direct vent wall furnace models EX17CT, EX17DT, EX22CT, and EX22DT using Rinnai FOT-series vent components.
