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Bard part BFAD-3 is an OEM barometric fresh air damper used on compatible Bard wall-mount HVAC cabinets to introduce controlled outside air into the return air stream for ventilation. This damper operates by pressure differential, opening as the unit moves air and helping maintain a steady fresh air intake without adding electrical controls. It is commonly referenced as the standard ventilation option on certain Bard wall-mount series, so it is a solid choice when you are replacing a damaged, missing, or sticking fresh air damper assembly and want the unit to ventilate the way it was originally configured. Confirm fit by matching the unit model and ventilation option in the Bard documentation before ordering.