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Cooler Master SickleFlow 120 - Sleeve Bearing 120mm 3-Pin LED Silent Fan for Computer Cases, CPU Coolers, and Radiators - Red

4.3 out of 5 stars 3,847 customer reviews
| 446 answered questions

Price: $8.34 & FREE Shipping on orders over $49. Details
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120mm - Red
Air Balance
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  • Transparent dark-gray fan blades for better LED effect
  • Long life sleeve bearing for longer life expectancy
  • Strong air flow to fortify cooling efficiency
  • Silent operation as an excellent choice for case cooling
  • RoHS compliance
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$8.34 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Cooler Master SickleFlow 120 - Sleeve Bearing 120mm 3-Pin LED Silent Fan for Computer Cases, CPU Coolers, and Radiators - Red
  • +
  • Cooler Master Hyper 212 EVO - CPU Cooler with 120mm PWM Fan (RR-212E-20PK-R2)
  • +
  • WD Blue 1TB SATA 6 Gb/s 7200 RPM 64MB Cache 3.5 Inch Desktop Hard Drive (WD10EZEX)
Total price: $88.32
Buy the selected items together


Product Description

Size: 120mm - Red | Style: Air Balance

The Cooler Master R4-L2R-20AR-R1 R4 Series Case Fan, with its dazzling red LED design, fits into any 120mm port in your chassis. Not to mention, the Cooler Master R4-L2R-20AR-R1 R4 Series Case Fan also features 50,000 hours of operation.

Product Information

Size:120mm - Red  |  Style:Air Balance

Technical Details

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Brand Name Cooler Master
Item model number R4-L2R-20AR-R1
Item Weight 12.4 pounds
Product Dimensions 4.7 x 4.7 x 1 inches
Item Dimensions L x W x H 4.72 x 4.72 x 0.98 inches
Color Red

Additional Information

ASIN B0046U6DTC
Customer Reviews
4.3 out of 5 stars 3,847 customer reviews

4.3 out of 5 stars
Best Sellers Rank #14 in Electronics > Computers & Accessories > Computer Components > Fans & Cooling > Case Fans
Shipping Weight 4.8 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available October 11, 2010

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Style Name: Air BalanceSize: 120mm - Non-LED Verified Purchase
Since this is a PWM fan, any review should be based on that fact. If you plug this fan into a 3 pin (non PWM) outlet, you will be shocked by how loud it is. But a PWM fan should only run at 100% when your system is nearly overheating. A properly tuned PWM fan should be at its lowest rpm (about 700 for this one) when you are surfing the web, and it should spin up only when your system gets hot (video compressing, gaming, etc).

This fan is perfect when used as a well tuned PWM fan. I use SpeedFan to customize my settings. I set the target CPU temp to 54 degrees C, and I allow it increments of 3 PWM (the default is 10, which causes noticeable noise changes). This creates an almost silent PC while idle (like surfing, word processing, etc). After a game has been running for 4 or 5 minutes, the fans get to about 1300rpm and the CPU holds at 54. At this speed, the fan is only audible if I mute the gaming noises, but even then, its not annoying. At minimum speed, in a completely silent room in a rural house, I have to strain to hear them at their lowest speed (700rpm).

I actually have three of these chained together using a rosewill pwm splitter. One is on the CPU heatsink, the other two are case fans. They all spin up when the system gets warm. They never seem to go beyond 50% even when gaming with a hot Radeon 4890.

For the price, this is the best value PWM 120MM fan I could find. The Scythe PWM 120mm seems like it might be able to push more air for a given db of noise, but you can get three of these fans for the price of two of those.
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Style Name: Air BalanceSize: 120mm - Non-LED Verified Purchase
I added this fan to my Hyper 212+ cpu cooler and it works great. I made the mistake of buying a different CM fan than this only to later realize that I needed a PWM fan. If you are adding a second fan to your Hyper 212+, this is the fan you want! It is relatively quiet and pushes alot of air. Great fan for the money!
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Style Name: Air BalanceSize: 92mm - Non-LED Verified Purchase
I purchased these fans to use in PC's because many of them require a PWM (Pulse Width Modulation) type fan for
connection to a 4-pin connector on the motherboards. It has good airflow, and fits anywhere a standard 3-pin
fan does in a computer case. It can also be used as a replacement fan on a cooler assembly, which many CPU's
require these days on motherboards using the 4 pin connector and PWM to control the fan assembly. Many of them
have 3 pin fan connectors for all other case fans.

Pulse width modulation is a way of controlling the fan speed using an amplifier on the motherboard, that will
vary the width of the signal (timing) or height (voltage) to increase or decrease the fan speed based on the
sensed CPU core temperature. A 3-pin fan by contrast, only receives a return signal on the 3rd wire telling
the CPU's fan operational amplifier it is spinning. Without the return voltage signal the computer will shut
down, signifying the fan has failed and turning off to protect your PC's processor from overheating. This is
also done for any other fan that has this type of support on the motherboard. That's why it's important that
you connect your fans to the motherboard connectors, instead of the power supply's.

These fans were used on an Intel DH55HC motherboard in an Antec 300 case. The Intel mobo has only PWM fans.
They were the 120mm and 80mm PWM Cooler Master fans.
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Style Name: Air BalanceSize: 120mm - Blue
Its a fan. It spins and makes pretty blue lights. It does its job. Not too noisy.
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Style Name: Air BalanceSize: 120mm - Blue Verified Purchase
I bought 2 of these to replace the fans that came in my case. I am very happy with these so far. They are very quiet and move plenty of air.My case temp hit about 40c tops with the fans set at the lowest speed setting in the BIOS.I have 2 Radeon 4770 cards running in crossfire mode, as well as having my system overclocked.
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Style Name: Air BalanceSize: 120mm - Non-LED Verified Purchase
Pros: Variable, and great when they work. Black

Cons: Quality control.

I ordered 3 at first, one scratched on the edges as it spun. It even left markings from doing so. I did an RMA on the single one. Figured well the other two are working great and I wanna move my whole case over to 4 pin fans. I ordered 3 more and they all had noisy bearings, scraping noises, etc. The RMA one came back and it seemed good at first until later I heard an offset, humming noise and tracked it down to that fan. I also heard one of the original ones starting to make noise. That is 6 out of 7 being unnecessarily noisy. I might up the rating if the next batch works out. Maybe I'm just unlucky or overly picky.
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Style Name: Air BalanceSize: 120mm - Red Verified Purchase
I have read reviews saying that these fans have to be mounted vertically and I can confirm that to be true. I first had them mounted up-side-down as exhaust fans for the top of my Antec Nineteen Hundred case and for the first two days they were okay, but then one of them started to click very loudly. I moved them to the heat-sink for my CPU and they finally shut up. However these are certainly not "silent" fans. I remember reading somewhere that these were supposed to be less than 30dB fans and I can assure you that they are no where near that quiet. Granted I haven't used a dB meter on them but my roommate is a sound engineer and he said "No F***ing way". The LED's are also not nearly as bright as the picture makes them out to be, All in all I won't return them since they were only $8 each but I certainly wouldn't buy more.
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