VIVOSUN’s AeroZesh T4 is a 4-inch inline ventilation fan bundled with the E12 speed controller, designed for quiet, efficient airflow in grow tents and small rooms. The EC motor with PWM control drives a mixed‑flow impeller up to 3000 RPM, producing a maximum 210 CFM (≈357 m³/h) while drawing only 20 W. Noise output is rated at 28 dBA, and the IP44 housing resists moisture in typical indoor grow environments. The included E12 controller offers 10 selectable speeds with backup memory and ON/OFF cycle modes; it can be upgraded to a GrowHub E42A controller for app-based automation. Key specs include 110–240 V input, 4-inch duct compatibility, and 2 m power/3 m controller leads, making installation straightforward in most 2×4–3×3 tents.