Monga tikudziwira, vacuummakina onyamula Zimachitika kudzera pampu ya vacuum yokhala ndi vacuum kulongedza, pogwira ntchito yake, kufunikira kofananako kutulutsa mpweya mkati mwa thumba, koma osafunikira kupondereza mpweya, mwanjira ina, sikuyenera kugwiritsa ntchito kompresa mpweya, koma sizili choncho.

