Features: This 8cm duct fan with USB adjustable speed control delivers powerful 50CFM airflows at 4500RPM, perfect for efficient ventilation in 3D printing stations and electronics workshops. Crafted from ABS plastic with ball bearing and detachable design, the blower features a compatible 8cm diameter duct connection for easy maintenance and long lasting performances. Designed for homeowners, DIYer enthusiasts, and indoor growers seeking improved air quality and humidity control in grow tents, kitchens, bathrooms, or pet areas. Effectively removes fumes in workshops, pet houses, RVs, and greenhouses while operating via 5V USB power sources like solar panel or standard adapter. The multipurpose ventilation exhaust fan maintains clean air in confined spaces like bathrooms through its directional airflows tube design. Specifications: Fan speed: 4500RPM Bearing type: double ball bearing Noise: 40dB Airflows: 50CFM Input voltage: 5V 2A Wire length: 150CM Size:Approx.8x8x7cm/3.14x3.14x2.75inch Air duct diameter 7.3cm Package Includes: 1 Set Ventilation Fan note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.