AC Infinity CLOUDLINE S4 Quiet Inline Mixed-Flow Duct Fan 4"

Compact 4-Inch Flagship EC Inline Ventilation Fan with 10-Speed Controller

Perfect for smaller grow tents (2×2 ft up to 3×3 ft), drying cabinets, and propagation spaces, the AC Infinity CLOUDLINE S4 delivers flagship ventilation performance in a compact footprint. Engineered with an upgraded, high-efficiency motor configuration, the S4 delivers a powerful 205 CFM (348 m³/h) of airflow while pulling an average of just 21 Watts.

Powered by a digitally controlled PWM EC motor, the S4 operates at an ultra-quiet 28 dBA, making it virtually imperceptible in domestic environments. Its mixed-flow impeller, stator blades, and hydrodynamic wind circles build strong static pressure (223 Pa) to overcome resistance from carbon filters and tight duct bends. Equipped with a 10-speed digital controller and direct native UIS™ connectivity, the S4 plugs effortlessly into smart controllers like CONTROLLER 69 for full app-based automated climate control.

What Makes It Stand Out

• Ultra-Quiet 28 dBA Performance: PWM-controlled EC motor eliminates motor hum and electrical whine, operating smoothly across all 10 speed levels up to 2800 RPM.
• High-Output 205 CFM Airflow: Provides rapid, continuous air exchange (348 m³/h) for compact grow tents, micro-grows, and nursery setups.
• Mixed-Flow High Static Pressure Design: Stator blades and hydrodynamic wind circles force air through dense carbon filter beds and restrictive ducting.
• 10-Speed Digital Controller Included: Fine-tune fan speed and noise levels with built-in memory that saves your speed setting during power interruptions.
• Native UIS™ Ecosystem Connectivity: Plugs directly into AC Infinity smart controllers for Wi-Fi/Bluetooth app access, automated VPD triggers, and dynamic climate scheduling.
• Detachable Motor Box & Easy Maintenance: Central impeller assembly unclips from the mounting frame for quick cleaning without disassembling your ducting setup.
• 67,000-Hour Industrial Lifespan: Features IP44 water and dust resistance, dual ball bearings, and 360° horizontal or vertical mounting versatility.

Technical Specifications

Real-World Applications

• Compact Grow Tents (2×2 ft & 3×3 ft): Primary extraction and carbon filtering fan for small flowering, vegetative, or seedling tents.
• Active Intake Booster: Supplies fresh, cool air into larger grow spaces to establish optimal static pressure balance.
• A/V Closet & Server Cabinet Cooling: Quietly exhausts high heat loads from audio-visual racks and home media servers.