It has strong ventilation because the upgraded fully enclosed pure copper motor offers fast smoke extraction, ventilation and keeps the indoor air clean and comfortable. It has seven thickened blades that deliver more powerful and even air volume, not easy to deform. It runs stably and vibrationfree, ensuring large air volume while reducing noise. It is made of iron material. There are several sizes to choose from, including 6 inches, 4 inches, 7 inches. Easy to install, suitable for kitchen, toilet, office, meeting room, restaurant, supermarket, cinema, internet cafe, workshop, waiting room, etc. Item Name Ventilation Fan Material Iron Features Bass Noise Reduction, Strong Wind, Super Suction Voltage 22V Frequency 50Hz Size Details 4 inch Black, Diameter 10cm3.94 Approx. 4 inch Black, Length 7.3cm2.87 Approx. 6 inch Black, Diameter 15cm5.91 Approx. 6 inch Black, Length 15cm5.91 Approx. 7 inch Black, Diameter 18cm7.09 Approx. 7 inch Black, Length 14cm5.51 Approx. 4 inch White, Diameter 10cm3.94 Approx. 4 inch White, Length 7.3cm2.87 Approx. 6 inch White, Diameter 15cm5.91 Approx. 6 inch White, Length 15cm5.91 Approx. 7 inch White, Diameter 18 cm7.09 Approx 7 inch White, Length 14 cm5.51 Approx Notes Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes 1Ventilation fanWhen shopping, pay attention to the size and dimensions of the product to ensure it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications.We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please dont hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you like it.