NA35-D1-Typ-III DA1300 Zone 22 Wet-Separator with Custom Suction Connection to Grinding Table. Khun Chatthaphat Siripunyanan of NHK Spring Company received the NA35-D1-Typ-III DA1300 Zone 22 Wet-Separator for Dedusting of Steel Sparks during the Grinding Process. Ruwac was selected due to detailed consultancy for the right vacuum solution and the correct performance provided specifically designed for this application.