Well, do not make the mistake of confusing these two devices to be the same. Both these devices are fans. Yet, there is a huge difference between the functions and the uses of these two devices.The function of the exhaust fan is to suck air out of the house.Of course, the entire process will never be completely efficient because the windows are open and there always will be inflow and outflow of air. turbo/fan can move air rapidly from one place to another (like a cooling fan-cold air moved to … replace hot air, or like a turbocharger-air through filter and induction manifold into cylinders) but with minimal (if any....) pressurisation, therefore you always end up with optimum air movement between two places.