Features: Experience ventilation with 4inch Inlines Duct Fan, featuring high efficiency exhaust systems, for enhancing Airflows in spaces like greenhouses and bathrooms. This fan boasts pure copper motor and pressurized fan blades, ensuring stable operation, reduced frictions, and increased air Circulations efficiency. for homeowners, gardeners, and pet owners seeking ventilation for small space such as cats litter boxes, grow tents, and dog houses. for environments including kitchens, basements, attics, and HVAC systems, this duct fan can be easily integrated into existing using various conversion connectors. with ABS construction and noise level of just 38dB, this fan provide quiet yet powerful Performances, making it excellent choice for maintaining air in any confined area. Specifications: Materials: PVC Length: 21cm Diameter: 9.7cm, 11cm Middle section: 15x12x13.6cm Wind pressure: 150Pa Noise: 42dB Airflows: 186m ³/h Input interface: 5.5x2.1mm Line length: 14cm Package Includes: 1Set Inlines Duct Fan note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item. Thank you!