Sesebelisoa sa "non-spring damper damper actuator" (hape se bitsoa "non-spring return" kapa "motorized damper actuator") ke sesebelisoa se sebelisoang lits'ebetsong tsa HVAC ho laola boemo ba dampers (lipoleiti tse laolang phallo ea moea) ntle le mochini o hahelletsoeng ka har'a selemo. Ho fapana le li-actuator tsa ho khutla ha selemo, tse itšetlehileng ka selemo ho khutlela sebakeng sa kamehla (mohlala, se koetsoe) ha matla a lahlehile, li-actuator tse seng tsa selemo li tšoara boemo ba tsona ba ho qetela ha matla a khaotsoe.