The Alerton® BACtalk® VAV-DD7 controller is a versatile BACnet-compliant terminal unit device that provides pressure-independent control of any dual-duct variable air volume (VAV) box. Three hot-switched outputs and four ground-switched triacs make the VAV-DD7 ideally suited for applications with auxiliary equipment. VAV-DD7—4 inputs, 2 flow transducers, 7 binary outputs, 3 hot switching ½ amp triacs, 4 ground switching ½ amp triacs.