ActronAir 8Z-VAV Ultima Zone Module is factory supplied and fitted to ESP Ultima indoor units, providing 24VAC Variable Air Volume control for up to eight zones via ActronAir Integrated Zone Barrel Motors to deliver Individual Temperature Control in every room. A failed 8Z-VAV module causes complete loss of VAV zone control across all zones — fit the 100% Genuine ActronAir 8Z-VAV to restore factory Ultima performance. This component is factory supplied and fitted — confirm application suitability with our team before ordering.