Ubushushu benkunkuma yemoto yeemoto zombane ezicocekileyo azikwazi ukuhlangabezana neemfuno zokufudumeza ebusika, ngoko ke ukufudumeza ebusika kuyingxaki ekufuneka iimoto zombane ezisulungekileyo zisonjululwe.Izifudumezi ezifanelekileyo zeqondo lokushisa (i-coefficient yokushisa echanekileyo, i-PTC) yenziwe ngezinto zokufudumeza ze-PTC ze-ceramic kunye neetyhubhu ze-aluminium, ezineenzuzo zokumelana ne-thermal encinci kunye nokusebenza kakuhle kokudluliselwa kobushushu, kwaye zihlaziywa ngaphantsi kwesiseko sezithuthi zamafutha.