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Bard 538-066 is an OEM MFAD Assembly 5-T used with Bard wall-mount equipment to provide controlled outside air ventilation through a motorized fresh air damper assembly. This internally mounted damper is designed to open when the unit blower is energized and uses a 24 VAC motor with spring return so it fails closed on loss of power, helping maintain proper building pressure and ventilation without compromising unit operation. If you are replacing a damaged or sticking damper, using the correct Bard 538-066 assembly helps ensure proper fit, wiring compatibility, and dependable fresh air control as originally engineered for MFAD-5 applications.