Fan Stirrer Blade A blade is the portion of a tool or machine with an edge that is designed to puncture, chop, slice or scrape surfaces or materials. Blades are typically made from materials that are harder than those they are to be used on. A blade may also refer to a fan blade such as that used in the movement of air or a gas. Fans are used across a wide variety of restaurant equipment to create airflow and dissipate heat. A fan consists of a rotating arrangement of vanes or blades which act upon the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing or case. This may direct the airflow or increase safety by preventing objects from contacting the fan blades. Specifications. Height 1.4 in.. Width 6.2 in.. Length 6.2 in.