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.
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.