RAB21 – Return Air Box for 21″ Applications

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When installing the WMA and WMP series air handler in an upflow application, the RAB 21 converts bottom-return air applications into a side-return air application. Use with the model RA 16 return air drop assembly for a complete side cold air return.

Assemble the RAB, then measure and cut-out openings to match the air handler and side air return.

Return Air Box Install Instructions

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