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Scythe S-FLEX SFF21F 120MM Cooling Fan 1600RPM 28.0DBA 63.7CFM FDB

This product can only be exchanged or replaced with the exact same item.
Scythe S-FLEX SFF21F 120MM Cooling Fan 1600RPM 28.0DBA 63.7CFM FDB - 1
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Reg. Price: $19.98  CAD
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Part #: SFF21F

SKU: 17749
Shipping Weight: 0.5 lbs
Shipping estimated: $5.99 *
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Product Videos [ Edit ]

Features [ Edit | History ]


S-FLEX Case Fan he high quality quiet 12cm fan with patent pending FDB (Fluid Dynamic Bearing) technology. This "Fluid Dynamic Bearing" technology from SONY Corporation can provide a dramatic reduction in fan noise and prolong the life of your fan.

Quick Specs:
Air Flow 1 x 63.7 CFM
Application/Usage Case
Package Contents
  • S-FLEX Case Fan
  • 4-pin Adapter
Connectors 3-pin TX3
Fan Diameter 1 x 120 mm
Fan Bearing Type Fluid Dynamic Bearing
Height 4.7"
Width 4.7"
Depth 1"
Number of Fans 1
Fan Speed (rpm) 1 x 1600 rpm

Specifications [ Edit | History ]

Fan Information  
     Air Flow: 1 x 63.7 CFM
     Fan Bearing Type: Fluid Dynamic Bearing
     Fan Speed (rpm): 1 x 1600 rpm
     Number of Fans: 1
General Information  
     Brand Name: Scythe
     Manufacturer: Scythe Co., Ltd
     Manufacturer Part Number: SFF21F
     Manufacturer Website Address:
     Product Name: S-FLEX Case Fan
     Product Type: Cooling Fan
     Connectors: 3-pin TX3
     Application/Usage: Case
     Package Contents:
  • S-FLEX Case Fan
  • 4-pin Adapter

Physical Characteristics  
     Depth: 1"
     Fan Diameter: 1 x 120 mm
     Fan Location: Side
     Height: 4.7"
     Width: 4.7"
Power Description  
     Input Voltage: 12 V DC

Customer Reviews of Scythe SFF21F

Product reviews on are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding Scythe SFF21F reviews.
Experience: 6 Months


great cooling fan, drops temps more than other expensive fans, great investment, would buy again
great cooling fan, drops temps more than other expensive fans, great investment, would buy again, have no complaints what so ever

This review was modfied by poster @ 01-16-12 05:04 PM

Experience: 1 Days


Good airflow,Robust construction,Quiet
none for the momment
If it was a little quieter and less expensive, i probably replace all my fan in my case with these. Awesome product scythe quality :)

Experience: 2 Weeks


- Good compromise between airflow and noise.
- None.
I got this to supplement the stock cooling on my Cooler Master 690 II Advanced case. I found it pretty quiet, with only a very small change in the overall noise level of the system. Depending on system load conditions and ambient temperature, this lowered my case temp by 3 to 8 degrees. It is still quiet enough that I could sleep in the room next door.

While airflow is not the best in the world, this offers a good compromise between airflow and noise level.

Experience: 2 Weeks


Good Price
Moves a lot of air.
Got this fan to use in a puch/pull on Coolermaster Hyper 212 cooler. it does an excellent job at moving the air. I noticed that the stock cooler has an almost unbearable whine at anything over 1500 RPM, so had to change MB settings to keep it below that. AMo going to order another of these to swap out the original.

Experience: 1 Months


-nice airflow
-long life
Installed in my antec 1200 case to increase airflow. Works as intended and is quiet. Wish it were abit more cheaper though.

Experience: 2 Weeks


* Moves Air Well, And Quietly
None Noticed Thus Far.
I purchased 2 of the fans as intakes in my Antec 300. Thus far they have performed well, though I would expect no less after only 2 weeks of operation.

Regarding noise, I can absolutely hear a difference in overall noise when these are running vs not running. It still doesn't disturb me, I'm just saying I can certainly hear a difference.

Experience: 1 Years


High CFM
Long life
Low(ish) DBA
Low static pressure
This fan pushes a lot of air and works great for circulating a case or on heat sinks which don't require much static pressure. This fan should virtually last forever so you shouldn't have to worry about replacing it for a few builds.

Experience: 9 Days


good for HSF
good fan for heat sink fan, great static pressure, kinda loud but does the job on a thermal right extreme 120.

long life bearings as it stated, and i hope it does last a year.

one con would be the price.

Cannon Fodder
Experience: 8 Days


Quiet, moves a decent amount of air, high rated MTBF
None so far....
Picked up this fan to add to my TRUE CPU cooler, to make up a push/pull setup, but wanted something to move a bit more air, so I replaced it shortly after.

As mentioned earlier, this fan does move a decent amount of air, while being fairly quiet, and another plus, is the large MTBF of 150,000 hrs., which, theoretically, should mean this fan will last a relatively long time, and quite possibly outlast many computer fans.

Experience: 1 Years


Moves a lot of air and quiet
High static pressure for pushing air through a heatsink
Long life
For case fans you may be better off with a Kaze slipstream that has less static pressure but is also less bulky.
Have two of these on my Thermalright Ultra 120 black edition hsf. They move a lot of air (1600 rpm) and are quiet. 1600 rpm seems to be the way to go for processor cooling. These have high static pressure and are thus excellent for heatsink cooling. Good ball bearing rated for long life. Excellent choice.

NCIX Forum Messages

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Messages about Scythe S-FLEX SFF21F 120MM Cooling Fan 1600RPM 28.0DBA 63.7CFM FDB

eta (Joel_M- Mar 13, 09, 0 Replies)
how will this run with the xigmatek? (EaGle1337â„¢ The fish- Aug 26, 08, 3 Replies)
This vs KazeJyuni (Redbeaver- Jul 06, 08, 23 Replies)
ETA on new stock (Christopher_S- Jun 02, 08, 1 Replies)
How loud Scythe? (Sen5es- Nov 13, 07, 6 Replies)
Does this work with fan controller? (Roger_C- Oct 22, 07, 1 Replies)
4 pin adapter (Garnet_A- Oct 04, 07, 5 Replies)
Back in stock ETA? (Andrew_H- Sep 27, 07, 7 Replies)
ETA? (MrDisco- Mar 01, 06, 2 Replies)

Post a New Message  |    All Messages       Browse NCIX Forums

Forum messages are not reviewed and may not contain accurate information about a product. Message contents are opinions from customers based on their own experience with a product. We do not recommend you make puchasing decisions based on Forum messages.

Reviews from the Web

Below are reviews found on other web sites for this product submitted by customers.

Comment: Small blurb about S-Flex fan included in the Thermalright Ultra 120 review. The Sony Fluid-dynamic bearing is the source of the low-noise.
Posted by: Erin_L @04/06/07
Submit a review link   |   Latest 30 reviews

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