AC Infinity Multifan S4, Quiet USB Cooling Fan, 140mm

AC Infinity MULTIFAN S4 Quiet USB Cooling Fan – 140mm Keep electronics, controllers and heat-producing equipment running cooler with the AC Infinity MULTIFAN S4 Quiet USB Cooling Fan. Featuring a larger 140mm fan design, the MULTIFAN S4 delivers up to 57 CFM of airflow while producing just 18 dBA of noise, providing powerful targeted cooling without excessive background noise. An integrated multi-speed controller allows you to adjust the airflow to suit your equipment and environment, while premium dual-ball bearings provide a rated lifespan of up to 67,000 hours. The bearing system also allows the fan to operate either horizontally or vertically, giving you plenty of flexibility when positioning it around your equipment. USB-powered operation, a generous 6ft cable, anti-vibration rubber feet and the ability to daisy chain additional compatible MULTIFAN units make the S4 an excellent cooling solution for grow room electronics, controllers, computers, AV equipment, games consoles, amplifiers and other heat-producing devices. Key Features Large 140mm USB cooling fan Delivers up to 57 CFM airflow Ultra-quiet operation at just 18 dBA In-line multi-speed controller with power switch Adjustable airflow for different cooling requirements Premium dual-ball bearing system Rated lifespan of up to 67,000 hours Can operate horizontally or vertically USB powered for simple installation 6ft / 1.8m power cable Eight anti-vibration rubber feet help reduce noise and movement Additional USB connection for daisy chaining compatible MULTIFAN units Up to four compatible fans can share a suitable USB power source Low 1.5W power consumption CE and RoHS certified Fan meets UL-507 safety standards Powerful 57 CFM Airflow The larger 140mm fan allows the MULTIFAN S4 to deliver up to 57 CFM of airflow, making it an excellent choice when more cooling performance is required from a compact USB-powered fan. Its larger blade area allows substantial volumes of air to be moved at relatively low fan speeds, helping provide effective cooling while maintaining exceptionally quiet operation. Ultra-Quiet 18 dBA Operation Despite its increased size and airflow capacity, the MULTIFAN S4 produces just 18 dBA of noise. This makes it particularly suitable for equipment that requires continuous cooling in noise-sensitive environments, providing effective airflow without the distracting sound associated with many conventional equipment cooling fans. Adjustable Multi-Speed Controller The included in-line multi-speed controller allows you to adjust fan performance depending on the amount of cooling required. Increase the speed when additional airflow is needed or reduce it when only gentle ventilation is required. This gives you greater control over the balance between cooling performance, airflow and operating noise. The controller also features a convenient power switch, allowing the fan to be turned off without disconnecting the USB cable. Premium Dual-Ball Bearings The MULTIFAN S4 uses premium dual-ball bearings engineered for reliable long-term operation. With a rated lifespan of up to 67,000 hours, the fan is suitable for applications where regular or continuous equipment cooling is required. The dual-ball bearing construction also allows the fan to operate in either a horizontal or vertical position without compromising its expected lifespan, providing much greater flexibility when positioning the unit. USB Powered for Easy Installation The MULTIFAN S4 is USB powered, allowing it to connect to compatible USB power sources commonly found on computers, AV equipment, games consoles and other electronic devices. A generous 6ft / 1.8m power cable gives you plenty of freedom when positioning the fan around equipment racks, cabinets and grow room electronics. With power consumption of just 1.5 watts, the S4 also provides an energy-efficient option for equipment requiring extended periods of cooling. Connect Multiple MULTIFAN Units For larger installations requiring additional airflow, compatible MULTIFAN S Series fans can be daisy chained together. Each fan features an additional USB connection, allowing up to four compatible MULTIFAN units to share the same suitable USB power source. This provides an easy way to expand your cooling setup without requiring individual power connections for every fan. Anti-Vibration Rubber Feet The MULTIFAN S4 includes eight large anti-vibration rubber feet that help absorb movement and reduce vibration transferred between the fan and surrounding surfaces. This allows the fan to be placed directly on top of or beside compatible equipment while helping maintain quiet and stable operation. Horizontal or Vertical Positioning Thanks to its premium dual-ball bearing construction, the MULTIFAN S4 can be positioned either flat or upright. This versatility makes it easier to direct airflow exactly where it's needed, whether you're drawing warm air away from electronics, pushing fresh air towards equipment or improving ventilation inside an equipment cabinet. Ideal for Grow Room Equipment Controllers, power supplies and other electronic equipment inside grow rooms can generate additional heat, particularly when several devices are positioned close together. The MULTIFAN S4 provides targeted airflow around these components without requiring a full-size circulation fan. Its combination of high airflow, low noise, compact dimensions and USB power makes it a convenient option for additional equipment cooling within indoor growing environments. Popular Applications Grow room controllers and electronics Power supplies and electrical equipment Computers and computer components AV receivers Amplifiers Games consoles DVRs and media equipment Routers and modems Electronic cabinets Equipment racks Home entertainment systems Other heat-producing electronics Technical Specifications Product AC Infinity MULTIFAN S4 Quiet USB Cooling Fan Model AI-MPF140A Fan Size 140mm Dimensions 14 × 14 × 2.5cm Maximum Airflow 57 CFM Noise Level 18 dBA Maximum Speed 1,200 RPM Static Pressure 0.84 mm-H2O Operating Voltage 3–7V DC Power Consumption 1.5W Current 0.3A Power Connection USB Cable Length 6ft / 1.8m Bearings Dual Ball Rated Lifespan 67,000 Hours Mounting Position Horizontal or Vertical Certifications UL, CE & RoHS MULTIFAN S1, S3 or S4? The MULTIFAN range provides several fan sizes, allowing you to choose the level of airflow that best suits your equipment and available space. MULTIFAN S1 – 80mm: Compact option delivering up to 26 CFM, ideal for smaller electronics and restricted spaces. MULTIFAN S3 – 120mm: Mid-sized option delivering up to 52 CFM for increased equipment cooling. MULTIFAN S4 – 140mm: Larger single-fan option delivering up to 57 CFM for applications requiring greater airflow coverage. For applications where space allows and maximum airflow from a single MULTIFAN is preferred, the 140mm S4 provides an excellent combination of cooling performance and quiet operation. Frequently Asked Questions How much airflow does the MULTIFAN S4 produce? The MULTIFAN S4 delivers up to 57 CFM of airflow from its 140mm fan. How quiet is the MULTIFAN S4? The fan produces just 18 dBA of operating noise, making it suitable for environments where quiet continuous cooling is important. Can I adjust the fan speed? Yes. The included in-line multi-speed controller allows you to adjust the fan to achieve the preferred balance between airflow and operating noise. Can the MULTIFAN S4 be laid flat? Yes. Its dual-ball bearing construction allows the fan to operate either horizontally or vertically, giving you greater flexibility when directing airflow around your equipment. Can I connect multiple MULTIFAN fans together? Yes. Compatible MULTIFAN S Series fans can be daisy chained together, with up to four compatible units sharing a suitable USB power source. Is the MULTIFAN S4 suitable for continuous use? Yes. The premium dual-ball bearing system has a rated lifespan of up to 67,000 hours, making the S4 suitable for applications requiring regular or extended operation. Powerful & Quiet 140mm Equipment Cooling The AC Infinity MULTIFAN S4 Quiet USB Cooling Fan is an excellent choice when you need increased airflow without the noise and bulk of a conventional circulation fan. Its large 140mm design delivers up to 57 CFM while maintaining an exceptionally quiet 18 dBA noise level. With adjustable speed control, USB power, long-life dual-ball bearings, anti-vibration feet and flexible horizontal or vertical positioning, the MULTIFAN S4 provides reliable targeted cooling for grow room equipment, computers, AV systems and a wide range of heat-producing electronics.