I-motori yemshini yokuvala ngokuzenzekela yenziwe ngokulandelana nokuthi imechanisi yokuvalela amashatu okugcina ngokuzenzekela emva kwebanga lelithakatha noma ngenkathi ethile. Lokhu kunceda ekhusebeni nokungcono. Ezinye izinto ezingavali manje ziyinhloko (isb., ukuvalela imizuzwana engu-5 emva kokuvula), inqamiso yomthombo wekhusele (isb., xa kwenziwa umoya), noma izindlela zokudla (isb., amandla amaningi noma ukubuyelela kwelanga). Ezi motore nezilayisi ezifaka kabusho, ekuvunywa kumasebenzisi ukuthi babuyeke isikhathi sokuvalela ngokwalo datha - izikhathi ezingaphansi kakhulu ezindaweni zokhuselela phakade, izikhathi ezingide ngokwezimali emasipaleni. Zidinga futhi ukuxhumeka nezinhawu zokubhala noma imicaba efanelekayo, ekuvunywa ukuba kube khona ukukhuphuka uma kudingekile ukuba isiku sivale. Izi motori zethu zokuvalela amashatu ngokuzenzekela ziphephile ezindaweni zokuthengisa (ezinkampani, i-offices) nezindaweni zokudla, ukuqinisekisa ukuthi amashatu awazi vekiwe ngokungazenzeki. Izi shatu zisebenza nabanye amathemu ase-Roller Shutter futhi zenze nezinhloso zokuhlinzela ukuvalela kahle. Ngokwamanje wokulayisha, izinketho zokuthiwani, noma ukucheka ukuthi kuyavumelana, qhagamise itekhnolojia yethekhaneli yethekhaneli.