Hon&Guan’s VortexFlow S4 is a 4-inch (100 mm) mixed‑flow inline duct fan designed for quiet, efficient ventilation in compact grow tents and small rooms. It uses an electronically commutated (EC) motor and a temperature/humidity smart controller with 10 speed levels and automated modes that react to high/low temperature or humidity setpoints. Maximum airflow is rated at 212 CFM (about 360 m3/h), helping move air through filters and duct runs while keeping noise low; the series lists 32 dB operation. The package is sold without a plug for flexible regional wiring. Typical uses include hydroponic tents, HVAC boosting, basements, and odor control when paired with a carbon filter. White finish with mounting base; probe cord connects to the controller. This model also has a European connector. This model is also available with a European connector.