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The Bard 8620-334 is an OEM return air (RA) sensor kit commonly used with Bard wall mount equipment that is equipped with a JADE economizer, providing a field installed sensor in the return airstream so the economizer can compare return or room conditions to outdoor air conditions and regulate outdoor air intake for proper ventilation control. This kit is a dependable electrical and controls component that helps restore accurate feedback to the economizer logic when troubleshooting ventilation performance, nuisance alarms, or inconsistent damper behavior, and it is a smart choice any time a damaged, missing, or out of tolerance return air sensor needs replacement to keep the unit operating to Bard specifications.