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Cooler Master SickleFlow 120 - Sleeve Bearing 120mm Silent Fan for Computer Cases, CPU Coolers, and Radiators (Smoke Color)

4.0 out of 5 stars 465 customer reviews
| 23 answered questions

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  • 69CFM @ 2000RMP (max.)
  • 19 dB-A silent application for CPU cooling
  • 50,000 Hours Fan Life Expectancy
  • 3-pin Fan Connector (3-pin to 4-pin Adapter included)
  • 12V DC Voltage, 0.35A Current, 4.2W +/- 10%
68 new from $5.69 2 used from $3.96
$9.35 & 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 Silent Fan for Computer Cases, CPU Coolers, and Radiators (Smoke Color)
  • +
  • Cooler Master Hyper 212 EVO - CPU Cooler with 120mm PWM Fan (RR-212E-20PK-R2)
  • +
  • Arctic Silver 5 AS5-3.5G Thermal Paste
Total price: $44.69
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Technical Details

  • Brand Name: Cooler Master
  • Model Number: R4-C2R-20AC-GP
  • Color: Non-LED
  • Device Type: Cooling
  • Manufacturer Warranty Description: 1 year


Product Information

Product Dimensions 4.7 x 1 x 4.7 inches
Item Weight 3.2 ounces
Shipping Weight 4 ounces (View shipping rates and policies)
ASIN B0026ZPFDE
Item model number R4-C2R-20AC-GP
Customer Reviews
4.0 out of 5 stars 465 customer reviews

4.0 out of 5 stars
Best Sellers Rank #38 in Electronics > Computers & Accessories > Computer Components > Fans & Cooling > Case Fans
Date first available at Amazon.com April 15, 2009

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Jaime Llamas on March 30, 2010
Verified Purchase
I love the fan works great!!!! The only thing is on Amazon it say its a 90CFM but it's a really 69CFM Fan !!!!!!
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Verified Purchase
The Good:
Light, almost entirely made of super light plastic.
Lots of blades for air movement
In my opinion, no LEDs which attracts bugs at night. Nothing more fun then finding spiders and insect bodies on the bottom of your case! (Sarcasm if you missed it)
Potential 90 CFM. For a 120 mm fan, that's awesome.
Comes with 3 pin converter to Molex (4 pin)

The Bad:
Somewhat loud, but hardly as bad as some other fans. 19 Decibels isn't bad.
Not free?

Conclusion:

Excellent buy for the price. Hard to find another 120 mm case fan that moves that much air for the same price.
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Verified Purchase
The flat screen monitor gets hot from its own reflected heat from inside the "cubbie" of the computer cabinet, so I added this fan to cool the monitor. The fan works great.

The fan is mounted at the back of the cubbie in the floor, which also cools the UPS and the VoIP module (Magicjack Plus). The fan is mounted with Bgears 120mm filter grill, Bgears wire grill finger guard and a Ultra vibration dampener.

The fan is powered by a 12VDC CCTV AC power adapter with a 2.1 x 5.5 male power jack. To power this fan you will need a 12VDC 0.5 Amp (or 500 ma) minimum. This fan is energy efficient. It uses only 4.2 to 4.5 watts, which means that running 24/7 this fan will take 9 to 10 days to use 1 kilowatt of electricity. In addition, running 24/7/365 the fan would last about 6 years (50,000 hours).

Had to modify the included power cable meant for a computer tower/cabinet. I used a soldered 2.1 x 5.5 female power jack with screw over housing because prefer soldered connectors, but you can use a CCTV 2.1 x 5.5 female power jack adapter (which are relatively afforded in multipacks here on Amazon) with screw terminals. (There are some posted photos.)

As with any "muffin" box style fans, using a filter will reduce airflow slightly. A rule of thumb is 10% to 15% depending on the filter, the cutout the fan is mounted to, etc.

This fan's 69.69 CFM with the filter on the intake side results is an airflow around 60 CFM give or take in this application, which is still 1 CFS (cubic foot per second). More than enough in many applications.

I used the included screws to mount the wire grill (finger guard and wires too) to the fan exhaust side. I lost one set of screws (bought 2 fans) and found that replacements can be purchased.
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Verified Purchase
Bought this fan to put on the front fan port on my new computer case as I wanted a stronger airflow being pulled in the front. I can easily tell by feel that this fan pulls nearly twice the amount of air as a "normal 120mm fan" would. Which would confirm its numbers of being able to move up to 69CFM. The fan its self is not too loud, you can hear it, but its not "jet engine" loud as I have heard some case fans be. I also appreciate the fact that this fan does not have any built in LED's. I know that seems to be the cool thing lately, but personally I don't want a computer that looks like a "rave party" gone wrong while simultaneously being filled up with pre-lit Christmas trees. I also like to run my computer over night often (doing work while I sleep) and with having my computer in my bedroom, its nice having a dark computer. I am a heavy gamer, graphic editor, photo editor, and game builder, and with this fan (along with others) I have never even come close to ruining into temperature problems off of an air cooled only rig (also bought a 4 pack of the 120mm cooler master fans). I would recommend this fan to anyone looking for a stronger high quality no LED fan.
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I’ve written only 1 other review in my life & it was because of a very positive experience I had with an Amazon seller. So reviews are rare for me, & negative/complaint reviews are non-existent, until now. I’ve ordered computer components from many companies over the years & Cooler Master takes the cake for the worst customer service & policies (practiced, not written) I have ever encountered.
I ordered 2 Cooler Master computer case fans on the same Amazon order about 5 months ago. In particular the “Cooler Master SickleFlow 120 - Sleeve Bearing 120mm Silent Fan for Computer Cases, CPU Coolers, and Radiators (Smoke Color)”, which has turned out to be anything but silent. Within a month the fan got louder upon computer start up, but settled down as it ran for a bit. I wish I had addressed it then, because Amazon would have handled it at this point with class, speed & efficiency, as they always do. The problem has gotten steadily worse. I believe it’s a bearing issue because when the fan starts up it is very loud now & vibrates the whole side of my PC case.
5 months have passed, so now it’s between me & Cooler Master because the fan comes with a 1 year manufacturer warranty; well in theory. In reality it has no warranty if Cooler Master will not communicate or work with you. I got Cooler Master’s email address from the net & emailed my issue & information (along with a copy of original invoice) to them & never got a reply. I went on website & couldn’t find a contact #. They want you to sign up for a Cooler Master Fanzone account. I have enough accounts to manage & didn’t want another one, so I called Amazon who responded immediately.
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