Roots vacuum pumps (ROVAC) are offered in sizes from 250 to 2,000 m3/h. These pumps couple with single stage rotary vane vacuum pumps (RVVAC S), double stage rotary vane vacuum pumps (RVVAC D) or rotary pistons vacuum pumps (RPVAC D) and reduce the final vacuum up to ten times. Double stage rotary vane vacuum pumps (RVVAC D) pumps comprise a wide spectra of research, chemical industry, pharmaceutical, food industries, metallurgy, mechanics, electronics, cooling and ventilation, aerospace, and different vacuum coating systems, vacuum furnaces and driers.