This is a 120 mm case fan
Thermalright Introduces TY-121BP FDB 120mm Case Fan It uses a hydrodynamic bearing with a declared service life of 40,000 hours, and the scope of delivery, along with the screws, includes rubber mounts designed to reduce the transmission of vibrations to the PC case.
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The fan is designed for connection to a four-pin connector. Using PWM, the rotation speed is adjustable in the range of 600-1800 rpm. At the same time, the airflow varies between 43.8-131.4 m 3 / h, and the noise level is within 19-25 dBA.
There is a novelty of 20 dollars. Later, the manufacturer plans to offer kits of several pieces, but their prices are still unknown.