The Toshiba Carrier Variable Refrigerant Flow (VRF) Rooftop, a rooftop unit-style fan coil for the Toshiba Carrier VRF system, allows multiple rooftop units to connect to one condensing unit and additional VRF fan coil units, Carrier says. The VRF Rooftop can utilize existing roof curbs and ductwork and can be installed without running refrigerant piping into the building. The VRF Rooftop also has economizer capability to bring in outside air, and when used in conjunction with CO2 sensors, helps with building codes and standards compliance, the company says. It’s available in 3-, 4- and 5-ton capacities.