This ventilation fan uses advanced ventilation technology to quickly and efficiently achieve convection of indoor and outdoor air, effectively improving indoor air quality. Its unique design is installed inside the pipe, does not occupy indoor space, and can effectively promote the circulation of indoor and outdoor air, providing users with a fresh indoor environment. The ceiling duct ventilation fan also has the characteristics of silent operation, which can maintain low noise even when operating at high speed, providing users with a quiet environment. This feature makes the ventilation fan very suitable for use in bedrooms, living rooms, offices and other places that require a quiet environment, without disturbing the user's rest or work. In addition, this ceiling duct ventilation fan is also durable and easy to clean. It is made of high-quality materials, has a sturdy and durable structure, and is easy to clean and maintain, providing users with a convenient use experience. In short, the ceiling duct ventilation fan is a uniquely designed and powerful ventilation equipment that provides users with a fresh and comfortable indoor air environment. It has beautiful appearance, excellent ventilation effect, quiet and stable operation, durability and easy cleaning. It is an ideal choice for home life and office environment.