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The Cooler Master R4-EXBB-20PK-R0 is designed to be a quiet yet effective case fan.

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Pros

Works pretty well as a radiator fan, too, if you turn the max rpm down a bit.

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Offers noticeably better airflow compared to stock fans.

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Fairly quiet compared to similar competing models.

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Blades can be removed for easy cleaning.

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Includes useful mounting accessories including rubber washers.

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Good, solid build quality (vent ring is metal, not plastic).

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Cons

Extremely noisy when mounted in a horizontal plane.

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Edit

 

The Cooler Master R4-EXBB-20PK-R0 is designed to be a quiet yet effective case fan. It uses a nine fan setup paired with Cooler Master's barometric ball bearing (BBB) technology to provide low noise cooling. The Sword like fan blades with triangular tips allows noise to be kept at a low level yet generating high air pressure and air flow. The three piece fan frame with metal rim ensures a durable and reliable construction. The BBB technology offers other features such as up to five times longer life expectancy compared to ball or sleeve bearing used in many other computer fans and the magnetic design enables the fan to run smoother and steadier. The Cooler Master R4-EXBB-20PK-R0 is a good option for buyers looking for a quiet and reliable case fan. 

Features / Specifications
  • Barometric Ball Bearing
  • 120 x 120 x 25 mm
  • 600 - 2000 RPM ± 10%
  • 26.4 - 85.6 CFM ± 10%
  • 13 - 30 dBA
  • 100,000 hours Life expectancy
  • 12 V DC
  • 0.45A
  • 6W Max
  • 4 Pin Connector
  • Includes: Rubber screw x 4, Metal screw x 4, Rubber pad x 4, 4-to-3 Pin adapter x 1
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