Ayyukan kwastomomi ta hanyar wucewa da gas ta hanyar dogon bututu (yawanci an rufe shi cikin solenoid), ƙyale zafi don tserewa cikin iska mai kewaye. Metals kamar jan karfe yana aiki da zafi sosai kuma galibi ana amfani dashi don jigilar tururi. Don inganta ingancin aikin ɗan adam, heat mai ɗaukar nauyi tare da kyakkyawan aikin heatsi ana ƙara da yankin zafi don hanzarta zafin zafi. Babban ƙaƙƙarfan ka'idar firiji shine cewa damfara ta ƙunshi injin matsakaici daga ƙarancin zafin da iskar ƙanƙara mai ƙarfi, sannan kuma ya haɗu cikin matsanancin zafi ta hanyar sandar ruwa ta hanyar kulawa. Bayan da bawul murƙushe ana jefa shi, ya zama low zazzabi da ruwa mai ƙarancin ruwa. An aika da ƙarancin zafin jiki da ƙarancin motsa jiki na mai ruwa, inda mai shayarwa a cikin ƙarancin zafin rana, wanda ke ɗaukar sake zagayowar firiji. Tsarin tsaftataccen tsarin compraigisitration guda ɗaya yana haɗawa da kayan haɗin asali na asali: frarraidor, contenser, bawulen farin ciki da mai ruwa. An sami nasarar haɗa su ta hanyar bututu don samar da tsarin rufaffiyar. Mai girki yana tattarawa koyaushe a cikin tsarin, yana canza jihar da musayar zafi tare da duniyar waje
