Sigma PRO series are extremely silent and affordable upgrade fans for cases, CPU coolers, and liquid cooling radiators. Precisely engineered blades provide improved airflow while HBS bearing ensures smooth and reliable operation.

Sigma Pro 140 PWM features flexible, dual 120/140 mounting. With its unique frame, it can be fitted in both 120 and 140mm fan locations with the included adapters.

It’s also an ultimate choice for CPU cooler fan upgrade (as long as there is enough room for fitting it) as PWM function allows a motherboard to automatically adjust rotation speed in the 500-1400 RPM range.