Cloudline S Series, Quiet Inline Duct Fan System With Speed Controller Designed to quietly ventilate grow tents, transfer heating/cooling to rooms, circulate fresh air, and cool AV closets. Features a wired 10-speed fan controller; also compatible with all UIS controllers with intelligent programming. PWM-controlled EC motor provides quiet and energy-efficient performance with minimal heat and noise. Mixed flow design with stator blade and hydrodynamic wind circles enable airflow delivery in high resistance areas. Available in 5 sizes — select a model above: S4: Duct Size 4" | Airflow: 205 CFM | Noise: 28 dBA S6: Duct Size 6" | Airflow: 402 CFM | Noise: 32 dBA S8: Duct Size 8" | Airflow: 807 CFM | Noise: 39 dBA S10: Duct Size 10" | Airflow: 1201 CFM | Noise: 48 dBA S12: Duct Size 12" | Airflow: 1604 CFM | Noise: 62 dBA
