Thermalright TL-B4020 40MM PWM double ball bearings 5500RPM quiet powerful desktop computer cooling fans Mini case cooling fan
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Specifications
- Brand Name
- Thermalright
- Model Number
- TL-B4020
- Origin
- Mainland China
- High-concerned chemical
- None
- Used For
- Case
- Voltage
- 12V
- Blade Quantity
- 7
- Air Volume
- 9.47
- Fan Speed
- 2000 - 5500
- Package
- Yes
- Noise
- 24.3dBA
- Fan Size
- Other
- Bearing
- Two Ball Bearing
- Power Interface
- 4PIN
- Choice
- yes
- semi_Choice
- yes
Product Description
Pros & Cons
Pros
- Dual ball bearing design for extended lifespan and reduced long-term maintenance
- Wide RPM range for customizable cooling performance based on system needs
- Low maximum noise level of 24.3dBA for quiet, unobtrusive operation
- 4PIN PWM interface for accurate, automatic speed regulation
Cons
- Airflow rating is listed as 9.47 without a specified unit, making performance comparisons difficult
- Only compatible with 12V power inputs, limiting use with other voltage system builds
- Small 40mm size only fits mini case builds, not full-sized ATX cases
- No mounting hardware is included in the product package per the listed specs
Common Questions
What size is this Thermalright cooling fan?
It is a 40mm mini case cooling fan designed for small form-factor desktop computer builds.
What bearing type does this fan use?
It features dual ball bearings for long-lasting, reliable performance compared to standard sleeve bearings.
What is the fan's speed range and maximum noise level?
Its fan speed ranges from 2000 to 5500 RPM, with a maximum noise level of 24.3dBA for quiet operation.
What power interface does this cooling fan use?
It uses a 4PIN PWM power interface for precise, adjustable speed control via your motherboard.
What is this cooling fan designed for?
It is specifically made to cool internal components of desktop computer cases to maintain optimal operating temperatures.
Product information last updated on December 20, 2025