... 3. Long lifetime; 4. IP55 protection; 5. Insulation F 2BHB double stage high vacuum blowers We are professional in air blower ... 10 years' manufacture experience, we have got good reputation from our customers. If you are interested in our products or ... . Usage: blow, Hoover, exhaust, cool, transport7. Structure:three phase & double stageModel name: 2BHB920-H17Type information:1. frequency(Hz): 50/602 ...