Chishandiso chemagetsi chekudzivirira kudzoka kwemagetsi chisiri chespring (chinonziwo "kudzoka kwespring" kana kuti "motorized damper actuator") chishandiso chinoshandiswa mumasisitimu eHVAC kudzora nzvimbo yemadampers (maplate anotonga kufamba kwemhepo) asina michina yechitubu yakavakirwa mukati. Kusiyana nemaactuator ekudzoka kwemvura, ayo anovimba nechitubu kuti chidzokere panzvimbo yachinogarwa (semuenzaniso, yakavharwa) kana simba rapera, maactuator ekudzoka kwemvura asiri espring anobata nzvimbo yawo yekupedzisira kana simba radzimwa.