Greenheck’s latest addition to its line of Vari-Green® energy control products is the VGD-100+ internal variable frequency drive. The VGD-100+ is equipped with Bluetooth communications and a smartphone companion app for set-up, status monitoring, and troubleshooting. Officials said the app replaces the need to access controls directly on the drive while providing an easier to understand display. Users can monitor the status of multiple fans, adjusting speed and settings as required when used according to app specifications. The VGD-100+ also adds four digital inputs, two digital outputs, and BACnet and Modbus communications. The factory-mounted Vari-Green drive aims to reduce the cost of installation, wiring, and commissioning.