Raxial S4, Inline Booster Duct Fan 4

AC Infinity’s RAXIAL S4 is a 4-inch inline booster fan designed to increase airflow in HVAC duct runs or to assist intake/transfer air in grow tents and rooms. Its die-cast unibody housing and balanced steel blades are driven by an AC brushless motor with permanently lubricated dual ball bearings (rated L10 67,000 hours) to minimize vibration and simplify mounting in any orientation. A wired knob controller lets you adjust speed and noise to suit the application. Key specs: duct size 4 in (≈10 cm), airflow up to 106 CFM (≈180 m³/h), noise 28 dBA, power 15 W, 110–120 V AC. Not intended for high static pressure or use with carbon filters; for those applications the brand recommends its CLOUDLINE series.