AC Infinity RAXIAL S4 Inline Booster Duct Fan – 4” with Speed Controller

Improve Your Airflow Instantly
The AC Infinity RAXIAL S4 is a high-performance 4-inch inline booster duct fan designed to increase airflow in HVAC systems and ventilate home spaces such as attics, workshops, kitchens, bathrooms, and basements. With a powerful 106 CFM airflow and ultra-quiet 28 dBA operation, this fan ensures smooth, efficient air delivery anywhere you need it.

Precision Variable Speed Control
The included variable speed controller lets you adjust airflow to match your exact needs. Whether you need gentle ventilation or maximum air movement, simply turn the knob to customize the speed and noise level.

Durable Unibody Construction
The die-cast steel housing features a seamless unibody design that reduces vibration and promotes smooth airflow. The fluted, ridged exterior makes installation secure and easy in any 4” ducting system.

Long-Lasting Performance
Powered by a reliable AC brushless motor, this booster fan uses balanced steel blades and permanently lubricated dual-ball bearings rated for a 67,000-hour lifespan. The dual-ball bearing design also allows both horizontal and vertical mounting without performance loss.

Complete Kit Included
Each package contains everything you need:
– 4” RAXIAL S4 inline booster fan
– Speed controller with plug
– Mounting screws
– Cable management set

Perfect for Home, HVAC & Grow Rooms
This versatile inline booster fan is ideal for:
• HVAC airflow boosting
• Attic & workshop ventilation
• Kitchens, bathrooms & basements
• Grow tents, grow rooms & indoor gardens (intake use)

Note: Not suitable for high static pressure systems or use with carbon filters. For stronger performance, see the AC Infinity CLOUDLINE Series.