Pfeiffer Adixen Cooling Fan Unit For MDP-5011 Turbo Drag High Vacuum Pump. The Adixen, Pfeiffer, MDP 5011 Turbo drag high vacuum pumps has a pumping speed of 7.5 liters per second (l/s). The MDP 5011 turbo drag pump inlet is LF NW ISO 63 with a ISO KF-16 exhaust foreline flange. The MDP 5011 turbo drag pump can be used for all general-purpose high vacuum applications. Cooling fan is set to 1 phase 115VAC, turbo without fan can run on 115VAC or 220VAC with Controller.