Their mesh cover and duct are constructed of stainless steel or galvanised steel wire, and the anti-corrosion rating ranges from C3 to C5-M. The surface can be painted or sprayed with plastic depending on the needs of the customer. Die-casting aluminium alloys with dependable and steady quality are used to make the impeller. The motor is supported by ABB, Siemens, Wright, and others. Its protection grade ranges from IP54 to IP56, and its insulation grade is either F or H. The motor and bearing can be tailored for individual customers.