AC Infinity MULTIFAN Mini, Quiet Compact 40mm USB Fan w/ Speed Controller
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Availability:
15 left in stock
Arrives
Wednesday, Oct 21
Size: 40 mm
Features
- Compact and energy-efficient USB fan designed various DIY cooling and ventilation projects.
- Features a multi-speed controller to set the fans 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 electronics and on portable power banks.
- Dimensions: 1.6 x 1.6 x 0.8 in. | Airflow: 12 CFM | Noise: 18 dBA| Bearings: Dual Ball
Description
Multi-speed controller The power switch allows you to adjust the fan speed to optimal noise and airflow levels for different applications and noise environments.
Product Dimensions: 0.8"L x 1.6"W x 1.6"H
Brand: AC Infinity
Power Connector Type: 4-Pin
Voltage: 12 volts
Wattage: 18 watts
Cooling Method: Forced air, forced convection
Compatible Devices: Devices with USB port
Noise Level: 18 db
Material: Rubber
Maximum Rotational Speed: 6000 rpm
Power Connector Type: 4-Pin
Voltage: 12 volts
Wattage: 18 watts
Cooling Method: Forced air, forced convection
Compatible Devices: Devices with USB port
Noise Level: 18 db
Maximum Rotational Speed: 6000 rpm
Air Flow Capacity: 12 cfm
Item Dimensions L x W x H: 0.8"L x 1.6"W x 1.6"H
Material Type: Rubber
Brand Name: AC Infinity
Item Highlight: UL-Certified, Dual-Ball Bearings, VR Gear, Aquarium, Roku, Router, Raspberry Pi, Cosplay, Helmet Cooling Ventilation
UPC: 819137020559
Number of Packs: 1
Manufacturer: AC Infinity
Number of Items: 1
Unit Count: 1 Count
Item Weight: 9.07 g
Model: AI-MPF40A
Part Number: AI-MPF40A
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Oct 21
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 40 mm
As an IT Admin for a small Transportation Company we have a large monitor set up so we can view all of our vehicles out on the road. After the remodel we wanted a better solution than using an older Dell PC which was using up precious desk space. We purchased an Intel W5 Pro with an Atom x5-z8350 & 2GB of Ram running Windows 10 Pro. As we just needed it to display a web browser we felt this solution which would free up space as well should do the job. After a few months of 24/7 operation I noticed the fan was starting to fail and temps started to rise. Finding the actual replacement fan didn't seem to be an option due to how proprietary the little fan was. Looking for a USB powered alternative I stumbled across this, took off the case on the W5 and strapped it to the top. Ugly? Sure, but as you can see adding the fan brought temps down from 70/80c to 36c!! With averaging around 55 or so with a moderate work load. As far as acoustics it's fairly silent on the lowest fan speed setting. I experimented with turning the speed up but didn't make that much of a difference. So keeping it on the lowest setting is best. The monitor has a USB port where it pulls power and the nice thing is that it will go to sleep when the monitor does. It is not connected to the compute stick as I didn't want to stress the little device any further. So... great little fan for 10 bucks. Moves a good amount of air, is quiet and has 3 speed settings. I highly recommend it.
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Reviewed in the United States on November 5, 2019 by DarkMikaruX
Size: 40 mm
Dont believe? Trust the plants! If you know begonias, they HATE water sitting in their leaves. Look at how theyre thriving in a high humidity, low vpd enviornment. The fan dries em off before they throw a fit in a pretty large enclosure. I'm using this along with some other ac infinity hardware to keep my GTPs bioactive enclosure in check and so far so good. Outstanding results. I can mist in the mornings, keep the fan on low for air exchange and evaporation and it keeps the VPD, humidity and temps in check on just LOW while I'm at work. Get home and the top of the soil is dry as its supposed to be, bottom remains moist for the clean up crew and he gets his drier period for the day while drying off plant leaves from the misting. It's TINY! But I can believe the 12cfm claim. Does the job in a 4ft tall, 30in deep, 4ft wide enclosure acting as an exhaust fan.
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Reviewed in the United States on August 25, 2026 by Rob
Size: 40 mm
I bought four of the 4" fans to squeeze into the rear slots in my entertainment cabinet. I suspected that I could use the silicone rubber feet to mount the fans, and it worked! The fans are held in place solely by the tight fit of the silicone washers against the edges of the cable cut-outs in the back of the cabinet. Since they are tight, and the rear of the cabinets are thin wood, at their highest RPMs, the fans make noise louder than the Xbox One X in the cabinet. However, at the "Medium" settings, the fans are no louder than the game console, and at the "Low" settings, the fans in the game console are louder. They really move a lot of air at the highest setting. I could feel quite warm air exiting the cabinet from the fans directly behind the Xbox One X, which vents heat out the rear of its housing. The other fans that were pulling air from mostly empty space were blowing out cool air. You can daisy-chain these together, but the speed control seems to affects all the other fans downstream. I had four of these connected together, with only one of them plugged into USB power. When I set the fan plugged into power to Low, the fan at the end of the chain stopped. Presumably, the other fans slowed down.
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Reviewed in the United States on February 20, 2020 by Johnny Rico Starship Trooper
Size: 40 mm
This isn't the first AC Infinity fan I've bought. On electronics that put out alot of heat, quite often the manufacturer doesn't provide for adequate ventalation so you have to replace your equipment more often, and they make more money. These fans help to remove that electronic destroying heat and extend the life of your investment! I used this particular fan to cool my D-Link Router, which puts out alot of heat, but yet has no cooling fans. Because of the small size of this AC Infinity fan, it is perfect for the improved removal of heat from the router. Plus, since it sets adjacent to my computer, there are plenty of USB ports handy. In the past I have also used AC Infinity fans for cooling my TiVo Bolt and my television. The fan is described as ultra quiet, which I feel is an exaggeration. It's quiet, but not ultra quiet. If I had one complaint, it would be that the cord is so long for MY router application. It would be nice if the cord length was adjustable. This item is designed in California, but it's MADE IN Communist CHINA. Despite being made in China however, the quality seems to be very good. I recommend this item.
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Reviewed in the United States on September 26, 2018 by Scott or not
Size: 40 mm
This fan is awesome! I didn’t expect much but it actually is a quality product, silent and very effective. I was searching for a cooling fan for Nintendo switch, there’re a lot of aftermarket products; most reviews on those that they’re either too loud, broke down too soon, or of cheap quality. Also, most cooling solutions aimed for the Nintendo switch would require to be either attached to the duck or to the console itself which would deplete its charge. This fan has the option to connect independently to a power supply or the dock, yet stay detached and mounted conveniently where you could place anywhere around the device you want to cool down or help in exhaust air suction.
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Reviewed in the United States on April 16, 2024 by Cheap quality. Easy to function but the minute it came out of the box one of the ear foam pieces fell out of the frame. Not great but that’s what you get for the price
Size: 40 mm
The cooling effect is suprisingly good. And definetly a plus on the rubber pads that dampen the any rattling noise. But the fan noise itself is a bit loud. Comparing to small fans from like noctua and noiseblocker, this is definetly louder.
Reviewed in the United States on July 11, 2026 by asfasdga
Size: 40 mm
I bought this to cool off my Crucial external SSD’s and it’s keeping them cooler than I excepted. I like that is has three fan speeds and an on and off switch so it isn’t running all of the time.
Reviewed in the United States on July 21, 2026 by Mary R
Size: 40 mm
I bought this rad little fan to help cool my new Boba Fett helmet. I sometimes wear this as my new face shield when I go shopping to bring people some smiles. The only problem is I live in Scottsdale, AZ and it gets super hot, and I was sweating to death. I added this sweet little fan with some stick-on velcro and plugged the USB into a small 3500 mAh battery pack that I can keep in my pocket because the cord is long enough. The fan is really quiet, but blows really well. I also love that the fan has a switch for High, Medium, Low and off. All I can say about this little fan is it delivers a nice breeze and feels very well built.
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Reviewed in the United States on August 28, 2020 by Andrew G.