Features sleeve/ball bearing , the fan can be work very quiet and silent, you may hard to hear the noise of it , but it also offer you 47 CFM airflow . The fan can work smoothly for 50,000 hrs at 25 ℃.
High performance DC brushless fan designed to maximize airflow CFM to noise dBA ratio. Double ball bearings rated at 67,000 hours allows the fans to be laid flat or stand upright.
Large air Valume Adopting high precision double ball bearings, life expectancy at up to 50,000hrs at 25℃ . PBT Frame and Blades, not easy to deform and break, long service life.
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