
Factory Price PWM Signal Speed Control 40mm 4cm 4010 Customized DC Fan. Customized Dimensions: Full customization available for dimensions from 25x25x7mm to 172x172x51mm. PWM Speed Control: Supports PWM signal speed control with speeds ranging from 4500 to 7000 rpm. Multiple Bearing Options: Available with sleeve, ball, or hydraulic bearings for diverse needs. Waterproof Capability: Optional waterproof levels from IP42 to IP68 for wet environments. Flexible Voltage Range: Supports 5V, 12V, 24V, and 48V DC with wide operating voltage tolerance. Low Noise Operation: Noise levels as low as 22 dB-A for quiet performance. OEM/ODM Service: Full customization including design, samples, and minor modifications available. Long Service Life: Up to 20,000 hours warranty for hydraulic bearing fans.