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Bard part S501-639 is an OEM vent box side assembly used on select Bard wall mounted HVAC units equipped with ventilation options, forming a structural side panel of the dedicated vent box section. This side assembly helps maintain proper alignment and sealing of the vent box components so the unit can reliably manage outside air intake and related ventilation operation without unwanted air leakage or vibration. If your existing vent box side is bent, corroded, or damaged during service, replacing it with the correct Bard factory part helps restore the vent box fit-up and supports long-term, trouble-free performance. Verify compatibility by matching S501-639 to your unit and parts manual callout before ordering.