What is the formula of the width of fan?

The concept of a “formula for the width of a fan” isn’t standard or universally recognized in physics, mathematics, or engineering without further context. Typically, the dimensions of objects like fans, which include parameters such as width, are determined by the specific design and purpose rather than a universal formula. In mechanical engineering and design, the dimensions of a fan (including width) are typically chosen based on the intended application, airflow requirements, space constraints, and efficiency considerations.

For ceiling fans, the width or diameter (more commonly referred to as the span) is chosen based on room size to ensure efficient air circulation. For industrial fans, dimensions are based on the required air flow rate, static pressure, and system requirements. However, there’s no singular formula that would determine the width of a fan universally, as it greatly depends on the application, the type of fan (ceiling fan, box fan, exhaust fan, etc.), and specific performance requirements.

If you have a specific type of fan or application in mind, providing more details might help in offering a more precise answer or directing you to applicable design considerations.