Raxial S4 - Inline Duct Booster Fan with Speed Controller 4"

  • Sale
  • Regular price $26.99

  • A duct fan designed to boost airflow in HVAC systems and ventilate home spaces like attics and workshops.
  • Features a variable fan speed controller, enabling you to optimize airflow and noise level for any application.
  • Unibody die-cast construction with no welded seams; reduces vibration while ensuring smoother airflow.
  • AC brushless motor with steel blades and lubricated bearings; not suitable in restricted airflow applications.
  • Duct size: 4” | Dimensions: 7.28 x 3.95 x 3.95 in. | Airflow: 106 CFM | Noise: 28 dBA | Bearings: Dual Ball


An inline fan for duct boosting designed to improve airflow in heating and air conditioning applications, and ventilate home rooms like attics, workshops, bathrooms, and kitchens. Each fan uses an easy-to-use knob controller that adjusts fan speed for your specific airflow boosting needs. It features a unibody framework that helps reduce vibration and ensures smooth and low-resistant airflow. The matte black steel cylinder is fluted and ridged for easy and secure installation in-between ducting. Its balanced steel blades have a 67,000-hour lifespan and spin using permanently lubricated dual-ball bearings to eliminate regular maintenance. The dual ball bearings also allow this fan system to be mounted horizontally or vertically. This kit includes one AC powered inline booster duct fan, a speed controller with a power plug, mounting screws, and a cable management set.


The inline variable speed controller can control the fan’s speed and turn it on or off. Turning the knob will increase or decrease the fan speed and optimize airflow and noise levels for your application. Its speed range includes a low, medium and high threshold, producing up to 106 CFM and 28 dBA in noise. This speed controller uses a female aviation plug with a metal retainer, tightly securing its connection to the booster duct fan.


This versatile inline booster fan is made to be installed in between ducting for various applications that need improved air delivery. In households, it boosts airflow from HVAC units to remove stale air and odor, ventilating attics, workshops, kitchens, basements etc. In grow tents, grow rooms, and indoor gardens, it’s primarily used as an intake fan to bring in fresh air. Please note this booster fan cannot be used standalone in high static pressure applications like room ventilation. Additionally, it is not suitable for use in applications with restricted airflow like systems that use carbon filters. For higher performance, see the CLOUDLINE Series.

 Product Identification
   Manufacturer    AC Infinity Inc.
   Product Name    RAXIAL S4
   Product Model    AC-RXS4
   UPC Code    819137021105
   Product and Mounting Dimensions - Fan Unit
   Duct Size    4"
   Total Dimensions    7.28 x 3.95 x 3.95 in. (18.5 x 10.0 x 10.0 cm)
   Cord Length to Controller    36 in. (3 feet)
   Cord Length to Plug    36 in. (3 feet)
   Product and Mounting Dimensions - Controller
   Total Dimensions    2.95 x 1.49 x 1.18 in. (7.5 x 3.8 x 3.0 cm)
   Required Mounting Area    1.49 x 1.18 in. (3.8 x 3.0 cm)
   Hole to Hole Distance    1.88 in. (4.8 cm)
   Screw Hole Size    Ø 0.197 in. (Ø 0.5 cm)
   Product Performance and Technical Specs
   Maximum Airflow    106 CFM
   Total Noise    28 dBA
   Static Pressure    4.90 mm-H20
   Operating Voltage    100V-125V AC
   Power    15 W
   Current    0.15 A
   Operating Humidity    35 to 85% RH
   Operating Temperature    0 to 158°F
   Fan Bearings    Dual Ball Bearing
   Mounting Positions    Horizontal or Vertical
   L10 Life Expectancy    67,000 Hours
   CE Certification (Whole Product)
   Product Manual PDF  
   Product Manual
   Product Manual
   Product Manual PDF