... )Cover mouth forms: conical suction mouth (A), Horseshoe suction mouth (L), plate suction mouth(T), hat-type suction mouth (H)other forms of ... can hover 360 degree arbitrarily with wind control valve for suction mouth.Its good tensible and hovering feature make it ... high strength, with power device, easy to operate, hover freely. Suction arm is widely used in metal processing,welding fume,workpiece ...