Air knives are used to remove excess zinc from the surface of galvanized strip to ensure an even coating thickness that matches the product specification. Tianjin Gongda Galvanizing Equipment Co., Ltd., has researched problems experienced in achieving consistent thickness coatings and has developed an air knife employing a complex air cavity design to assure an even flow of air along the whole length of the air knife. The design allows changes in the air knife gap to meet individual requirements. (The company also manufactures air knives used for steel pipes, highway guardrails and steel wire).