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The Bard 8602-019 Minimum Position Potentiometer is an OEM control component used in Bard wall mount economizer and ventilation damper setups to set and fine tune the minimum damper blade position so the unit maintains the required outside air intake during operation. When this potentiometer fails or drifts out of range, you may see inconsistent ventilation settings or a damper that will not hold the intended minimum position. Replacing with genuine Bard part 8602-019 helps restore correct damper minimum position adjustment and dependable system control on compatible Bard equipment.