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Bard 8602-033 is an OEM mixed air thermostat used in Bard wall mount HVAC systems and related ventilation or economizer applications to monitor the temperature of mixed air where outdoor and return air blend. When this control is operating correctly, it helps the unit maintain stable discharge air conditions and protects the system from running outside intended temperature limits during ventilation or economizer operation. This Bard factory part is a direct-fit replacement intended to restore proper mixed air temperature control, so match the part number to your unit model and wiring before ordering to ensure correct application.