--- product_id: 6470798 title: "AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling" brand: "ac infinity" price: "₨15586" currency: LKR in_stock: true reviews_count: 13 category: "Ac Infinity" url: https://www.desertcart.lk/products/6470798-ac-infinity-multifan-s4-quiet-140mm-usb-fan-ul-certified store_origin: LK region: Sri Lanka --- # 57 CFM airflow Ultra-quiet 18 dBA noise USB-powered with daisy-chain AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling **Brand:** ac infinity **Price:** ₨15586 **Availability:** ✅ In Stock ## Summary > 🌀 Stay cool, stay ahead — silence and power in perfect harmony. ## Quick Answers - **What is this?** AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling by ac infinity - **How much does it cost?** ₨15586 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/6470798-ac-infinity-multifan-s4-quiet-140mm-usb-fan-ul-certified) ## Best For - ac infinity enthusiasts ## Why This Product - Trusted ac infinity brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Whisper-Quiet Cooling:** Operate in near silence with just 18 dBA—perfect for focused work or gaming marathons. - • **Plug & Play Convenience:** UL-certified USB power means effortless setup behind your AV gear, consoles, or computer cabinets. - • **Powerful 57 CFM Airflow:** Maximize heat dissipation with robust airflow that keeps your electronics running cool and efficient. - • **Durable Dual-Ball Bearings:** Enjoy a long-lasting 67,000-hour lifespan with versatile mounting options—lay flat or stand upright. - • **Seamless USB Daisy-Chaining:** Connect up to 4 fans on a single USB port for scalable, modular cooling without cable clutter. ## Overview The AC Infinity MULTIFAN S4 is a UL-certified, ultra-quiet 140mm USB fan delivering 57 CFM airflow at just 18 dBA noise. Featuring durable dual-ball bearings rated for 67,000 hours, it offers flexible mounting and daisy-chain USB connectivity for scalable cooling solutions ideal for gaming consoles, DVRs, and computer cabinets. ## Description desertcart.com: AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling : Electronics Review: Almost Invisible/Stealth Quiet - Im writing this review during a very HOT unusual few June weeks in Minnesota, its been over 90 for almost 2 weeks now, I have a full size 42U server rack for my home lab, it has a big hole on top that nobody's exhaust fans fit, 21 x 5.5, but the 140mm measurements of this fan is just big enough that I can sit about 4 of them on top of the racks hole. I work in Tech Recycling, so I see what happens to most tech equipment when its removed from service, its rare to see AC Infinity products, I rescued a old AC Infinity Controller they don't appear to sell anymore, but its similar to the one they sell now, and rescued a 2U Rackmount 4 fan with controller unit, I was amazed how quiet the rack mount fan unit was even after many years of use, the LCD controller is a bit hard to read, but other then that it works fine. So I needed some USB fans to plug into the other controller I rescued, I was concerned there was only 2 USB ports, which is the same as new model they currently sell, but when these fans arrived, I saw a lovely daisy chain USB connector, apparently you can have up to 4 of these on 1 of the USB controller ports so those 2 ports give you maybe 8 fans , I don't need that much, but its a nice feature, I plugged these in to the old controller set it on AUTO and away they go. The controller appears to have Low/Med/High setting but these fans also have a 4 way switch on the cord which seems to be 1 notch higher then whats available on the controller, I have them maxed, very light hum, not much more then my laptop fans on a hot day. Compared to others, I have rescued hardwired plug and run fans with no thermostat, that sound like a bunch of servers running, so these are by far the quietest ive heard (almost can't tell they are running), Now that I know they daisy chain, I bought 2 more, with 4 of these at about $15 each vs $300-400 exhaust fans that are usually 120mm, they sell for most racks this is a great deal and larger. Perfect product, not sure how strong they are? they are not as FAT/DEEP as some Ive seen at work, its very hot, my rack runs about 3-4 degrees hotter then the room its in, so even with the fans they are having a hard time cooling it down, but air circulation is always good. its hard to get cool when the room itself is hot upper 80s, and rack is maintaining lower 90s. Only thing I would add to this product, RGB colors would be nice for those of us that like adding colors to our loved computers, but probably wastes electricity and reduces power so maybe its better they don't have color lights. (only if it don't sacrifice cooling power) CLIPS, since Im buying 4 of these to fill that big 5.5 x21 inch hole in my rack that normally a bunch of wires would go through, but in my home lab all wires go down, Im using that hole as a exhaust for the heat to exit up to the ceiling, these cool rubber feet are nice, but it would be nice to clip these together with some kind of clip so instead of 4 loose fans its 1 big fan. The feet are good, but since I have 3 cats that can jump on top of the rack it would be nice to link these fans together with some kind of bracket or clip just in case, not too worried about it, but it would be a nice modular feature. Lucky for me its only hot in Minnesota 3 months a year, so most the year these fans won't have to work hard, but they are running 24/7 now in a near 90 degree room. These would be great for quiet rooms, chances are your normal household fan is louder. Love the product, both the old ones I rescued that were not quite ready to be recycled yet, and these new fans. Review: Excellent cooling solution — fixed my overheating router instantly - Bought these during the summer when my internet started cutting out. Turned out my router and modem were overheating. Added these AC Infinity USB fans and the problem was immediately fixed. They’re quiet, move plenty of air, and I really like that they can be daisy-chained so multiple fans can run off one USB port (I daisy chained the 120 and 140 together and plugged them directly into my router). Setup was simple and clean. They’ve been running continuously for months with no issues. Solid, reliable, and absolutely worth it. ## Features - 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00MWH4FL4 | | Air Flow Capacity | 57 cfm | | Best Sellers Rank | #2 in Computer Case Fans | | Brand | AC Infinity | | Brand Name | AC Infinity | | Compatible Devices | Amplifier | | Cooling Method | Air | | Customer Reviews | 4.7 out of 5 stars 3,179 Reviews | | Global Trade Identification Number | 00854759004365 | | Item Dimensions L x W x H | 1"L x 5.5"W x 5.5"H | | Item Weight | 9.07 g | | Manufacturer | AC Infinity | | Material Type | Rubber | | Maximum Rotational Speed | 2000 rpm | | Model | AI-MPF140A | | Noise Level | 18 db | | Number of Items | 1 | | Part Number | FBA_AI-MPF140A | | Power Connector Type | 4-Pin | | Product Dimensions | 1"L x 5.5"W x 5.5"H | | UPC | 854759004365 | | Unit Count | 1 Count | | Voltage | 5 volts | | Wattage | 1.5 watts | ## Product Details - **Brand:** AC Infinity - **Compatible Devices:** Amplifier - **Cooling Method:** Air - **Material:** Rubber - **Maximum Rotational Speed:** 2000 RPM - **Noise Level:** 18 Decibels - **Power Connector Type:** 4-Pin - **Product Dimensions:** 1"L x 5.5"W x 5.5"H - **Voltage:** 5 Volts - **Wattage:** 1.5 watts ## Images ![AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling - Image 1](https://m.media-amazon.com/images/I/713+w3dU6UL.jpg) ![AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling - Image 2](https://m.media-amazon.com/images/I/715TZNiNZAL.jpg) ![AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling - Image 3](https://m.media-amazon.com/images/I/61937PlfmYL.jpg) ![AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling - Image 4](https://m.media-amazon.com/images/I/71Wzh47qmHL.jpg) ![AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling - Image 5](https://m.media-amazon.com/images/I/61-6CgQl2iL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: What is the rpm on these?** A: I am not sure of the exact rpm. I can tell you that I have 7 of these. 1 80mm, 4 120mm, 2 140 mm. I use them on top of my receiver, under my laptop, router and on my nas. Very quiet while still pushing or pulling a good cfm number. Sorry I do not know the exact rpm speed but if your looking at a home theatre application I think these will work great. If you want cfm and some noise is OK you can probably do better. **Q: How many watts does it consume?** A: With the a/c adapter used, 1.8 watts. Used without the a/c adapter (as usb powered) .80 of a watt. **Q: 14 months ago I purchased 3 140mm units for 24x7 usage; all 3 now fail to spin and just jiggle when plugged in. Anyone else have high failure rate?** A: Out of three 140mm and four 120mm units, that I own and have been running for approximately 24 months... One failure. Sent it back and got a replacement with no issues; blade broke. **Q: I see the power cord has a usb connector on one side. is the cord hard wired to the fan or is there a connector? if a connector what type?** A: It is a full powered USB port? Or does the fan speed switch also affect the power coming out of the USB female attached to the fan? ## Customer Reviews ### ⭐⭐⭐⭐⭐ Almost Invisible/Stealth Quiet *by D***3 on June 9, 2021* Im writing this review during a very HOT unusual few June weeks in Minnesota, its been over 90 for almost 2 weeks now, I have a full size 42U server rack for my home lab, it has a big hole on top that nobody's exhaust fans fit, 21 x 5.5, but the 140mm measurements of this fan is just big enough that I can sit about 4 of them on top of the racks hole. I work in Tech Recycling, so I see what happens to most tech equipment when its removed from service, its rare to see AC Infinity products, I rescued a old AC Infinity Controller they don't appear to sell anymore, but its similar to the one they sell now, and rescued a 2U Rackmount 4 fan with controller unit, I was amazed how quiet the rack mount fan unit was even after many years of use, the LCD controller is a bit hard to read, but other then that it works fine. So I needed some USB fans to plug into the other controller I rescued, I was concerned there was only 2 USB ports, which is the same as new model they currently sell, but when these fans arrived, I saw a lovely daisy chain USB connector, apparently you can have up to 4 of these on 1 of the USB controller ports so those 2 ports give you maybe 8 fans , I don't need that much, but its a nice feature, I plugged these in to the old controller set it on AUTO and away they go. The controller appears to have Low/Med/High setting but these fans also have a 4 way switch on the cord which seems to be 1 notch higher then whats available on the controller, I have them maxed, very light hum, not much more then my laptop fans on a hot day. Compared to others, I have rescued hardwired plug and run fans with no thermostat, that sound like a bunch of servers running, so these are by far the quietest ive heard (almost can't tell they are running), Now that I know they daisy chain, I bought 2 more, with 4 of these at about $15 each vs $300-400 exhaust fans that are usually 120mm, they sell for most racks this is a great deal and larger. Perfect product, not sure how strong they are? they are not as FAT/DEEP as some Ive seen at work, its very hot, my rack runs about 3-4 degrees hotter then the room its in, so even with the fans they are having a hard time cooling it down, but air circulation is always good. its hard to get cool when the room itself is hot upper 80s, and rack is maintaining lower 90s. Only thing I would add to this product, RGB colors would be nice for those of us that like adding colors to our loved computers, but probably wastes electricity and reduces power so maybe its better they don't have color lights. (only if it don't sacrifice cooling power) CLIPS, since Im buying 4 of these to fill that big 5.5 x21 inch hole in my rack that normally a bunch of wires would go through, but in my home lab all wires go down, Im using that hole as a exhaust for the heat to exit up to the ceiling, these cool rubber feet are nice, but it would be nice to clip these together with some kind of clip so instead of 4 loose fans its 1 big fan. The feet are good, but since I have 3 cats that can jump on top of the rack it would be nice to link these fans together with some kind of bracket or clip just in case, not too worried about it, but it would be a nice modular feature. Lucky for me its only hot in Minnesota 3 months a year, so most the year these fans won't have to work hard, but they are running 24/7 now in a near 90 degree room. These would be great for quiet rooms, chances are your normal household fan is louder. Love the product, both the old ones I rescued that were not quite ready to be recycled yet, and these new fans. ### ⭐⭐⭐⭐⭐ Excellent cooling solution — fixed my overheating router instantly *by S***Y on December 31, 2025* Bought these during the summer when my internet started cutting out. Turned out my router and modem were overheating. Added these AC Infinity USB fans and the problem was immediately fixed. They’re quiet, move plenty of air, and I really like that they can be daisy-chained so multiple fans can run off one USB port (I daisy chained the 120 and 140 together and plugged them directly into my router). Setup was simple and clean. They’ve been running continuously for months with no issues. Solid, reliable, and absolutely worth it. ### ⭐⭐⭐⭐⭐ Perfect fan for all electronics ECT *by K***N on June 26, 2026* This is a great fan for my PS4 and I can put my laptop on it to keep it cool, I like the fact that you can connect up to 5 fans and very quiet. ## Frequently Bought Together - AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling - AC Infinity Turbo Fan Power Adapter, for MULTIFAN Series USB Fans - AC Infinity MULTIFAN S3, Quiet 120mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.lk/products/6470798-ac-infinity-multifan-s4-quiet-140mm-usb-fan-ul-certified](https://www.desertcart.lk/products/6470798-ac-infinity-multifan-s4-quiet-140mm-usb-fan-ul-certified) --- *Product available on Desertcart Sri Lanka* *Store origin: LK* *Last updated: 2026-07-24*