AC Infinity CLOUDLINE PRO 4" Inline Duct Fan 350m3/h

AC Infinity CLOUDLINE PRO 4-Inch Inline Duct Fan for Quiet Ventilation

The AC Infinity CLOUDLINE PRO S4 is a high-performance 4-inch inline duct fan designed for quiet, efficient air movement in a wide range of ventilation applications. With a maximum airflow of up to 350 m3/h and a power draw of 28 W, this inline fan delivers strong performance while maintaining low noise output and energy-efficient operation. It is an excellent choice for grow tents, hydroponic grow rooms, AV closets, bathrooms, attics, cabinets, and other spaces that require consistent air circulation and controlled ventilation.

Powerful 4-Inch Duct Fan with 350 m3/h Airflow

Built for demanding airflow needs, this 4-inch duct fan provides up to 350 m3/h of maximum fan performance. The mixed-flow design helps maintain steady airflow even in environments with higher resistance, making it suitable for ducted systems, exhaust setups, and transfer applications. Whether you need to boost ventilation, move heated or cooled air, or improve overall air exchange, the CLOUDLINE PRO S4 offers reliable performance in a compact format.

10-Speed Airflow Control for Precise Ventilation

This duct fan includes a wired 10-speed controller that allows you to fine-tune fan speed according to your ventilation requirements. The airflow regulation makes it easy to balance noise, performance, and energy use for different environments. From low-speed continuous operation to stronger airflow for more intensive ventilation tasks, the controller provides flexible adjustment for greater comfort and efficiency.

PWM-Controlled EC Motor for Quiet and Efficient Operation

The AC Infinity CLOUDLINE PRO uses a PWM-controlled EC motor designed for smooth, quiet, and energy-efficient operation. This advanced motor technology helps reduce heat and motor noise while maintaining stable performance across speed levels. Thanks to precise electronic control, the fan can run efficiently at lower speeds without unnecessary noise, making it ideal for spaces where acoustic comfort matters.

Mixed-Flow Fan Design for High Static Pressure Applications

The inline fan features a mixed-flow design with stator blades and hydrodynamic wind circles, helping it deliver airflow effectively in restrictive ducting systems. This design supports ventilation in high static pressure applications where standard fans may struggle. It is especially useful in installations that require airflow through filters, bends, longer duct runs, or other resistance-heavy configurations.

Quiet Ventilation for Grow Tents, Rooms, and AV Equipment

Designed with versatility in mind, this inline duct fan is suitable for many residential, commercial, and horticultural applications. It is commonly used to ventilate grow tents and grow rooms, circulate fresh air, transfer heating or cooling between rooms, exhaust bathrooms and attics, and cool AV closets, racks, and cabinets. The combination of airflow power and low noise makes it a practical solution for a wide variety of indoor air management needs.

Durable Construction with Dual Ball Bearings and IP44 Rating

For long-term reliability, the CLOUDLINE PRO S4 is equipped with dual ball bearings rated for extended service life and flexible mounting in horizontal or vertical positions. The unit also carries an IP44 ingress protection rating, helping it resist dust and moisture in challenging environments. With a rated lifespan of up to 67,000 hours, this duct fan is built for dependable operation over time.

Compact Inline Fan Dimensions and Easy Installation

The fan unit is designed to fit standard 4-inch duct systems while maintaining a compact form factor for simple installation. Its overall dimensions make it easy to integrate into ventilation systems where space is limited. The included controller features a long cable for convenient placement, helping you position the controls where they are most accessible during daily use.

Technical Specifications of the AC Infinity CLOUDLINE PRO S4

• Manufacturer: AC Infinity Inc.
• Product Name: CLOUDLINE S4
• Product Model: AI-CLS4
• Duct Size: 4 inches / 100 mm
• Maximum Airflow: 350 m3/h
• Airflow: 205 CFM
• Noise Level: 28 dBA
• Power: 28 W
• Voltage: 100-240V AC
• Frequency: 50/60 Hz
• Current: 0.4 A
• Max Speed: 2800 RPM
• Static Pressure: 223 Pa
• Bearings: Dual Ball
• Mounting Positions: Horizontal or Vertical
• Ingress Protection: IP44
• L10 Life Expectancy: 67,000 Hours

Why Choose This 4-Inch Inline Duct Fan

The AC Infinity CLOUDLINE PRO S4 combines quiet operation, reliable airflow, and modern speed control in one efficient ventilation solution. Its 4-inch format, strong airflow capacity, and mixed-flow engineering make it a smart choice for projects that require dependable air movement with low acoustic impact. If you are looking for a powerful inline duct fan that balances performance, efficiency, and durability, this model offers an excellent combination of features for everyday ventilation and specialized air handling tasks.