AC Infinity RAXIAL S4 Inline Booster Duct Fan

The AC Infinity RAXIAL S4 inline booster duct fan is a compact 4-inch solution for increasing airflow in ductwork, grow tents, and indoor gardens, ideal as both a duct booster fan and inline fan for grow tent intake. A die-cast unibody housing, balanced steel blades, and dual ball bearings (rated for 67,000 hours) provide smooth, low-vibration operation, pushing up to 106 CFM at just 15 W and a quiet 28 dBA.

4-Inch Inline Fan for Grow Tents and Hydroponics

Perfect for hydroponic rooms and grow tents, this 4-inch inline duct fan helps pull fresh, cool air into your space to control heat and humidity and improve plant health and CO₂ exchange. The included speed controller lets growers dial in airflow for seedlings, veg, or bloom, while the slim cylinder mounts horizontally or vertically in tight spaces—best used as a booster fan on open or lightly restricted ducts rather than on high static pressure setups or carbon filters.

Key features:

• Targeted grow tent airflow: 4-inch inline booster duct fan delivers up to 106 CFM, improving intake or transfer air to maintain stable conditions across the canopy.

• Better temperature and humidity control: Increases fresh air exchange in grow tents and hydroponic rooms, helping reduce heat from lights and manage humidity buildup.

• Adjustable airflow for each growth stage: Inline speed controller lets you fine-tune fan speed for delicate seedlings, vigorous veg, or high-demand flowering plants.

• Quiet operation in indoor grow spaces: Low-vibration die-cast housing and balanced steel blades keep noise around 28 dBA, ideal for discreet home grows.

• Durable, low-maintenance design: Permanently lubricated dual-ball bearings and a 67,000-hour lifespan mean reliable, long-term use without constant servicing.

• Slim, flexible mounting in tight tents: Compact cylinder body mounts horizontally or vertically in 4" duct runs, perfect as a booster on long duct lines from your primary inline fan or HVAC (not recommended directly on carbon filters or very high static pressure systems).

Component	Specification	Value
Controller	Total Dimensions	2.95 x 1.49 x 1.18 in. (7.5 x 3.8 x 3.0 cm)
Controller	Required Mounting Area	1.49 x 1.18 in. (3.8 x 3.0 cm)
Controller	Hole-to-Hole Distance	1.88 in. (4.8 cm)
Controller	Screw Hole Size	Ø 0.197 in. (Ø 0.5 cm)
Fan Unit	Duct Size	4"
Fan Unit	Total Dimensions	7.48 x 11.89 x 6.93 in. (19.0 x 30.2 x 17.6 cm)
Fan Unit	Mounting Hole-To-Hole Distance	3.15 x 2.36 in. (8.0 x 6.0 cm)
Fan Unit	Screw Hole Size	Ø 0.197 in. (Ø 0.5 cm)
Fan Unit	Cord Length to Controller	72 in. (6 feet)
Fan Unit	Cord Length to Plug	72 in. (6 feet)
Fan Unit	Maximum Airflow	106 CFM
Fan Unit	Total Noise	28 dBA
Fan Unit	Static Pressure	4.90 mm-H20
Fan Unit	Operating Voltage	110V-120V AC
Fan Unit	Power	15 W
Fan Unit	Current	0.15 A
Fan Unit	Operating Humidity	35 to 85% RH
Fan Unit	Operating Temperature	40 to 140 °F
Fan Unit	Fan Bearings	Dual Ball Bearing
Fan Unit	Mounting Positions	Horizontal or Vertical
Fan Unit	L10 Life Expectancy	67,000 Hours