SKU: 33232255303

AC Infinity MULTIFAN S4 Quiet USB Cooling Fan 140mm

Sale price$36.89 Regular price$40.99
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Ships within 48 hours · Estimated delivery Jul 29 - Aug 3

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Description

AC Infinity MULTIFAN S4 Quiet USB Cooling Fan 140mmDescription Ultra quiet UL certified USB fan designed to cool various electronics and components. Features a multi speed controller to set the fan's speed to optimal noise and airflow levels. Dual ball bearings have a lifespan of 67,000 hours and allows the fans to be laid flat or stand upright. USB plug can power the fan through USB ports found behind popular AV electronics and game consoles. Fan Size: 5. 5 x 5. 5 x 1 in. Airflow: 57 CFM Noise: 18

Description
  • Ultra-quiet UL-certified USB fan designed to cool various electronics and components.
  • Features a multi-speed controller to set the fan's speed to optimal noise and airflow levels.
  • Dual-ball bearings have a lifespan of 67,000 hours and allows the fans to be laid flat or stand upright.
  • USB plug can power the fan through USB ports found behind popular AV electronics and game consoles.
  • Fan Size: 5.5 x 5.5 x 1 in. | Airflow: 57 CFM | Noise: 18 dBA | Bearings: Dual Ball
  • Product Description: The ultra-quiet cooling fan can be positioned to stand upright or laid flat to cool various electronics and components. Features a multi-speed controller with power switch. Includes eight large anti-vibration rubber feet and a 6-foot power cord. The USB plug can be plugged into the USB ports found behind popular electronics such as receivers and video game consoles. Each unit contains an additional USB port, up to four fans can be daisy chained together to share the same power source. This fan system is CE and RoHS certified and contains premium dual-ball bearings, allowing it to be mounted horizontally or vertically. Contains AC Infinity axial fans ACX-FD1425(B)05W3 which meet UL-507 standards for safety under Underwriters Laboratories certificate E503903.
  • Speed Controller: The fan includes an in-line multi-speed controller with power switch to set the fan's speed to optimal noise and airflow levels for various environments.
  • Connecting Additional Units: For electronics and components that requires more airflow, each fan unit can daisy chain additional MULTIFAN S series fans. Up to four fans can share the same USB power source; and up to six fans can share the same thermal controller (sold separately). MULTIFAN S1, S2, S3 and S4 contains one fan, and MULTIFAN S5 and S7 contains two fans.
  • Applications: This ultra-quiet cooling fan is popular in a variety of electronics and components such as receivers, DVRs, video game consoles, modems, computers, amplifiers, and other audio video equipment.
  • Specifications
  • Product Identification
  • Manufacturer: AC Infinity Inc.
  • Product Name: MULTIFAN S4
  • Product Model: AI-MPF140A
  • UPC Code: 854759004365
  • Product Dimensions
  • Total Dimensions: 5.5 x 5.5 x 1.0 in. (14.0 x 14.0 x 2.5 cm)
  • Hole to Hole Distance: 4.92 x 4.92 in. (12.5 x 12.5 cm)
  • Screw Hole Diameter: 0.17 in. (0.4 cm)
  • Cord Length: 72 in. (6 feet)
  • Total Airflow: 57 CFM
  • Total Noise: 18 dBA
  • Speed: 1200 RPM
  • Operating Voltage: 3 to 7V DC
  • Power: 1.5 W
  • Current: 0.3 A
  • Wall Adapter Input: 100 to 240V AC
  • Static Pressure: 0.84 mm-H2O
  • Operating Humidity: 35 to 85% RH
  • Operating Temperature: 0 to 158 degrees F
  • Fan Bearings: Dual Ball
  • Mounting Positions: Horizontal or Vertical
  • L10 Life Expectancy: 67,000 Hours
  • Data Sheets
  • Download the AC Infinity DC Fans UL C UL Recognized E503903: here
  • Download the AC Infinity MULTIFAN Series CE Certificate CTL1811096016 EC: here
  • Download the AC Infinity Fans RoHS Certificate SZXEC1900087001: here
  • Download the user manual: here
  • Shipping Notes
    • Free Standard Shipping on $100+ Orders to the USA.
    • Except Preorder products are shipped in 48 hours.
    • Delivery to the USA:
    1. Standard Shipping : 3-10 business days
    • If time is of the essence, please consider selecting expedited delivery for faster service.
    Exchange/Return Notes
    • We offer a 30-day return/exchange service after receiving.
    • Final sale items are not eligible for returns or exchanges.
    • To process your return/exchange, please contact us at [email protected]
    • Please click here for more details>>> Return & Exchange Policy
    SKU: 33232255303

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    4.2 ★★★★★
    Based on 30 reviews
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    Product Reviews
    J
    Verified Purchase
    JD
    Charlottesville, US
    ★★★★★ 5
    Good quality
    Color: Black
    Have used the frother 5 days in a row. It comes already charged. Fingers crossed no issues when I eventually have to charge it. I love everything about it. It’s worth a little bit of extra money as you can control the blending power from slow to fast. Easily held with both hands to coordinate. Today for a change I elected to just add a touch of bourbon caramel syrup to my oat milk -an excellent choice! They give you two attachments which is helpful. I’m not hard on my kitchen appliances but it’s good to know I have an immediate back up if needed. I rinse frother attachment out immediately in a cup of warm water and air dry on a towel. At this point, I highly recommend. My next adventure in the kitchen will be Matcha tea. I will use the bamboo whisk for the actual tea. If I decide to add oat milk to the top,(such as for a cold latte) I will use this frother.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on June 4, 2026
    I
    Verified Purchase
    Izzy
    Belleville, US
    ★★★★★ 5
    Higher quality then I expect, very satisfied
    Color: Gray
    High quality overall, very high powered. It looks really fancy and elegant. The adjustable speed knob on the top is really great. The stand looks really nice but isn't the best design because it is easy to knock over when you take it out, that's my only issue with it.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 26, 2026
    J
    Verified Purchase
    JMB
    Chelsea, US
    ★★★★★ 5
    Mixes my protein shake powder
    Color: Blue
    My husband and I both drink protein shakes daily. We have vortex mixers that work great, but they are plastic and getting old, and really needed to be replaced. In an effort to reduce microplastics in our lives, I am trying to use less plastic mixing cups. I couldn't find anything small enough (other than regular blenders) with glass and metal parts that would work well for us. During my search on here, several frothers showed up. This one caught my eye because of the amount of sales, quick delivery, and of course, decent pricing. Some of the reviews had me a little skeptical, and time will tell regarding the longevity, but so far I am pleased. My protein powders are on the heavy side, but this little frother really gets the job done. Instead of having to use separate mixing cups (saving me on dishwashing), I just use my morning coffee cup (it's big enough) to mix my protein shake in. My husband just uses a regular glass. Neither of us can believe the power this little thing has. We are getting smooth shakes! Here is what I really like about it: It is powerful and mixes well; the frother is metal and not plastic; it cleans extremely easy; after making several shakes the battery has not died; can be used in glasses, coffee cups, even disposable cups (when we buy donut shop coffee); and I love the little stand which takes up barely any counter space. Less plastic, less clean-up, dependable (so far), and small, making it convenient even for travel. I'm really glad I got this, and hope it will last. One last thing, do not turn it on while cleaning under running water. (Yes, you can laugh.)
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on April 20, 2026
    D
    Verified Purchase
    David A.
    Lake Worth, US
    ★★★★★ 5
    Powerful frother with a long rechargeable battery life
    Color: Black
    After purchasing three of the battery operated frothers. I finally found this amazing frother. It is very powerful so you do have to be careful not to slosh liquid out of your cup when you’re using it. But I have found it helps if you rotate the frother in a stirring motion while you are using it. That really helps keep the liquid from overflowing out of the cup. It has a sleek design and is rechargeable and the charge less about two weeks.I love this one so much. I take it with me when I travel. I actually left my original one at my mother’s house the last time I visited her and have ordered another one for my house. Highly recommend.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 27, 2026
    M
    Verified Purchase
    MJFinds
    Charlottesville, US
    ★★★★★ 5
    Great Power and Creamy Foam
    Color: White
    This frother is amazing and has really good power. It creates creamy, smooth foam in seconds and works perfectly for iced lattes, cappuccinos, and matcha. I love that it’s rechargeable and lightweight, but still feels strong and high quality. As someone who loves coffee, this has become one of my favorite tools for making café-style drinks at home. Easy to use, easy to clean, and looks beautiful on my coffee station.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 20, 2026

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