Imashini ikoresha amashanyarazi idasubira inyuma (izwi kandi nka "non-spring return" cyangwa "moteri damper actuator") ni igikoresho gikoreshwa muri sisitemu za HVAC kugira ngo kigenzure aho dampers ziherereye (plaque zigenzura ikirere) zidafite uburyo bwubatswemo bwa spring. Bitandukanye na mashini zikoresha amashanyarazi, zishingira kuri spring kugira ngo zisubire aho zisanzwe (urugero, zifunze) iyo amashanyarazi yabuze, mashini zikoresha amashanyarazi zidasubira inyuma ziguma mu mwanya wazo wa nyuma iyo amashanyarazi yaciwe.