Features: Experience the power of efficient air circulation with the inline duct fan, featuring a high-speed variable frequency motor and impressive airflow for optimal ventilation. Designed with durability in mind, this inline fan boasts a robust case and a pure copper outer rotor brushless motor that ensures continuous operation without overheating or deformation. For hydroponic enthusiasts, indoor gardeners, and homeowners seeking to enhance their living space's air quality, this duct fan caters to those who prioritize a healthy and comfortable environment. This inline duct fan is a customizable solution for maintaining temperature and humidity levels in your targeted spaces. Can be used with various 12V power adapters, battery power supplies, and exhaust systems. Specifications: Component: PVC Size: Approx. 14cm / 5.51 inch Inner diameter of circular tube: 5cm / 4cm / 3.2cm / 2.5cm Rotating speed: 24300 r/min Noise: 53 dB Wind pressure: 450 Pa 25mm air volume: 30 m³/h 32mm air volume: 35 m³/h 40mm air volume: 45 m³/h 50mm air volume: 55 m³/h Input interface: 5.5x2.1mm Package Includes: 1 x Ventilation Exhaust Fan Note: 1. Please allow 1-2 cm errors due to manual measurement. Ensure you are comfortable with this before ordering. 2. Due to differences between monitor displays, the picture may not reflect the actual color of the item. Thank you for your understanding.