Pumps and fans of various types and sizes are used in all kinds of restaurant equipment. The main internal component of these pumps and fans is the impeller. The impeller is a rotor blade designed to increase the pressure and flow of air, gases or fluids. Specifications. Material Stainless Steel. Power 1.4 HP. Height 2.1 in.. Width 5.05 in.. Length 4.55 in.