Static compression by "internal" volume reduction. The ZEPHYR can achieve vacuum up to 150 mbar (abs) and capacities between 100 and 600 m3/hr. as well as pressure up to 2.2 bar(g) at flow rates between 100 and 600 m3/hr. In combined operation simultaneous vacuum up to -0.6 bar and pressure up to +1.0 bar can be obtained.