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100mm (4'')Vtronic made Fan. They have 2/3 speeds and the ratings on them are below.
They have an IP rating of 44, Operational Temperature at -20℃~+60℃ and V0 flame-retarded rating for fireproof ,Anti-acid .
Standard 3 Years Warranty, and are rated at 50,000 hours continous running.


Description

1).The shell is made of polypropylene plastic, one-time disposable molded, with high anti-acid function.
2) . Using ABS blades, design by hydromechanics to reach the optimal air and pressure.
3) .Two-speed/Three-speed motor, imported NMB ball bearing, it's life expectancy up to 50,000 hours.
4) .IP44 Protection class, waterproof and dustproof more effective.
5) .Can be designed with a delay function, temperature sensors and humidity sensors, more of user-friendly features design.
6) .Run the ambient temperature range: -20°C~60°C.