* E hloekile; E entsoe ka motsoako oa aluminium oa sefofane, e ke ke ea rusa.
* Ho theoha hanyane ha kgatello; Dikamore tsa ho kenya le ho ntsha metsi di entswe ka tsela eo moya o fetang ka hara dikamore tsa ho kenya le ho ntsha metsi le ka hara mokoti wa ho monya metsi ho etsa convection, ka hona ho fokotsa ho theoha ha kgatello.
* Bophelo bo bolelele: Bophelo ba tšebeletso bo ka fihla lilemo tse 30, 'me bo phekoloe ka oxidation le thibelo ea mafome.