AC Infinity CLOUDLINE S8 PRO Quiet 8 Inline Duct Fan - High Airflow

Our review of the AC Infinity CLOUDLINE S8 PRO finds it best suited for growers and tech users who need strong airflow without audible distraction. The unit's biggest selling point is its combination of high measured airflow and a very quiet PWM-controlled EC motor, which delivers useful ventilation for hydroponic grow rooms, AV closets, and HVAC boosting. Setup is straightforward and the wired 10-speed controller gives fine-grain control, so anyone who values controllable performance and low operating noise will appreciate this fan.

Key Features

• High airflow: The mixed flow impeller design and stator blade produce up to 807 CFM, moving a lot of air for ventilation or cooling tasks.
• Quiet EC motor: The PWM-controlled EC motor runs at low noise levels (about 39 dBA) while remaining energy efficient and producing less heat than typical AC motors.
• 10-speed controller: The included wired 10-speed fan controller provides precise manual speed adjustments and is compatible with UIS controllers for intelligent programming.
• Built for resistance: Hydrodynamic wind circles and mixed flow geometry sustain airflow even in higher-resistance duct runs or filters.
• Durable bearings: Dual ball bearings extend operational life and provide stable performance in continuous-use environments.
• Versatile use: Sized for 8 in ducting and compact dimensions, it fits grow tents, closets, and inline boost applications.

Who It's For

The CLOUDLINE S8 PRO is ideal for indoor gardeners running medium-sized grow tents or hydroponic cabinets who need reliable extract and circulation without loud fan noise. It also suits AV racks and small server closets where continuous, quiet ventilation and controllable speeds matter.

Users who need only occasional, low-power ventilation for large open rooms or who require specialized duct sizes other than 8 in should consider different models. If absolute lowest price is the primary concern rather than longevity and control, a simpler fan might be a better fit.

Pros & Cons

Pros

• Very quiet operation with a PWM-controlled EC motor, so equipment rooms stay unobtrusive.
• Strong airflow (807 CFM) and mixed flow design keep air moving through filters and ducting.
• Wired 10-speed controller plus UIS compatibility gives flexible control and automation options.
• Solid build with dual ball bearings for extended runtime and reliability.

Cons

• At 8 in duct size, it may not suit larger centralized HVAC needs where higher diameter fans are required.
• Some users may prefer wireless or remote control options rather than the wired controller provided.

Specifications

Duct Size	8 in
Dimensions	8.5 x 11.9 x 9.2 in
Airflow	807 CFM
Noise Level	39 dBA
Motor Type	PWM-controlled EC motor
Bearings	Dual Ball

Our Verdict

The CLOUDLINE S8 PRO is a worthwhile buy for growers and IT/AV users who require high airflow with minimal noise and precise speed control. Its efficient EC motor, durable bearings, and programmable controller make it good value for continuous-use ventilation where quiet, controllable performance matters most.

Frequently Asked Questions

Is the controller easy to install?
The wired 10-speed controller is straightforward to connect and offers simple manual adjustments; it also works with UIS controllers for advanced programming.

Will this fan run quietly in a bedroom or office?
Yes, the PWM EC motor keeps noise around 39 dBA at higher speeds, so it is noticeably quiet in normal rooms and dedicated closets.

Can it handle filters and long duct runs?
The mixed flow design with stator blades maintains good airflow in higher-resistance setups, making it suitable for ducting with filters or moderate lengths.