TT PRO 150 is Vents-US’s 6-inch inline mixed-flow fan for round-duct ventilation. The dual-speed 120 V/60 Hz model uses a mixed-flow impeller in an aerodynamic plastic housing and is rated at a maximum 378 CFM at 0 in. w.g. (about 642 m³/h). It comes with a built-in two-speed switch and power cord, long-life ball bearings, and thermal overload protection. Typical uses include apartments, grow rooms, and light commercial spaces where compact size and higher static-pressure capability are needed. The unit is ETL listed and supported by a two-year warranty. Duct size is 6 inches (150 mm).