A centrifugal fan is a type of fan that is more common for industrial purposes, as it has a larger diameter than a blower. It is typically used in large spaces with a lot of ventilation needs, such as warehouses and factories. It is an efficient type of fan that can push a lot of air through a small space. A blower is more common for household purposes, as it is smaller and quieter. It is typically used in spaces that need a more targeted flow of air, such as kitchens and bathrooms.