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Bard part number 7003-021 is an OEM washable foam air filter assembly sized 10x20x1, built with a 0.25 inch foam media and an aluminum frame rated for UL Class 2 use. This filter is designed to protect the indoor coil and blower section from dirt buildup while helping maintain proper airflow in compatible Bard wall-mount and air handler applications. For best results, confirm the filter size and part number against your unit parts list, then clean and reinstall the filter on a routine schedule to support stable system performance and reduce nuisance service issues caused by restricted airflow.