Isici:
1. Isithando somlilo sisetshenziselwa ukugcina nokugcina ukushisa kwamanzi e-aluminium;
2. Imishini enamandla yokushintshanisa ukushisa (ubuchwepheshe belungelo lobunikazi), ukusetshenziswa kabusha kokushisa kwemfucumfucu ye-flue, ukongiwa kwamandla nokuvikelwa kwemvelo;