... special requires.(for example add blower shelves,vacuum pump)We'll give you a lower ... series roots blower applicationsZYSR series roots blower widely used in electricity,petroleum,steel industry,smelling,food,oxygen making,spinning,vacuum ... -78.5Kpa Motor Power:0.75-300kw Rotary speed:740-2130rpm3.Free charge Standard Accessories all ... valve.4.Contact: three lobes rotary vacuum roots blower(manufacture)