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Bard WISP-4 is an OEM return inside sound plenum used on Bard WA and WH wall-mount HVAC equipment to help reduce return-air noise transmission and maintain proper indoor return-air routing to the unit. This plenum is built as a formed, durable steel assembly designed to fit the matching Bard return grille and wall opening arrangement, helping technicians restore the original acoustic performance and airflow path when the existing plenum is damaged, missing, or has been modified in the field. For best results, verify the WISP-4 application against your unit model and the accessory list for your specific Bard wall-mount series before ordering to ensure correct fit and interface with the return air grille and filter setup.