be quiet!

be quiet! Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium Low Noise Cooling Fan | 4-Pin | BL099

Name: be quiet! Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium Low Noise Cooling Fan | 4-Pin | BL099
Brand: be quiet!
SKU: B0B74CP6X2
Price: 29.90 USD
Availability: InStock

By SpecPicks Editorial · Verified 2026-07-07

$29.90

Buy on Amazon — $29.90 Compare to similar power supplies

*Price sourced from Amazon.com. Last updated 2026-07-07. Price and availability subject to change.

Bottom line: The be quiet! Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium Low Noise Cooling Fan | 4-Pin | BL099 is a niche pick — read recent reviews before buying in the power supplies category, priced around $29.90. Read recent reviews carefully before committing.

SpecPicks Verdict

SpecPicks classifies be quiet! Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium… as a niche pick — read recent reviews before buying in the power supplies category, based on our editorial and benchmark analysis and our ranking model that weights rating × review-volume × price-fit. be quiet!'s positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.

Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Pros & Cons

Pros

✓ Optimized fan blades for the highest performance on radiators and heat sinks
✓ Backed by be quiet!'s warranty and support channels
✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

Key Features

Optimized fan blades for the highest performance on radiators and heat sinks
Speed switch allows changing maximum PWM speed between medium-speed, high-speed and ultra-high-speed (up to 2400 rpm)
Small tip clearance and a fan frame with a funnel-shaped air outlet for extremely high air pressure
Virtually inaudible operation at regular speed
6-pole fan motor and fluid-dynamic bearing for less vibration and very smooth operations

Full Specifications

Brand	be quiet!
Model	BL099
Voltage	12 Volts
Wattage	3.04 watts
Material	Copper
Set Name	PWM Pro Version
Unit Count	1.0 Count
Noise Level	36.8 Decibels
Part Number	BL099
Compatibility	Switch
Material Type	Copper
Cooling Method	Fan
Number of Items	1
Vibration/Rumble	Yes

Ready to buy?

be quiet! Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium Low Noise Cooling Fan | 4-Pin | BL099 is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Check price on Amazon →

*Price sourced from Amazon.com. Last updated 2026-07-07. Price and availability subject to change.