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The Bard 500-194 Left Side Insulation Assembly is an OEM internal insulation component used in select Bard wall mount and packaged HVAC units to help reduce cabinet heat transfer and air leakage where the unit structure meets the left side panel area. Replacing worn, water-damaged, or missing insulation helps the system maintain proper temperature control, supports efficient operation, and can reduce nuisance sweating and vibration-related noise inside the cabinet. As a direct-fit Bard factory part, 500-194 is intended to match the original placement and thickness so your unit goes back together correctly after service; verify compatibility by model and serial number before ordering.