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Bard part 8602-003 is an OEM damper assembly sized 18 x 42 that is used in Bard ventilation and airflow control sections to regulate intake or discharge air as the unit operates. Replacing a worn or damaged damper helps restore proper air management, supports correct building pressurization, and can prevent comfort complaints tied to stuck or leaking blades. As a genuine Bard replacement part, 8602-003 is built to match the original fit and function expected in Bard wall mount HVAC equipment, but you should always confirm the opening size and the specific unit model and serial number before ordering to ensure compatibility.