ʻOku ʻiloʻi lahi ʻoku fakatou ngaohi ʻa e keipolo ʻo e kalava tafe mai mo e ngaahi puha fale mei stainless hokoʻanga ukamea pe foila alloy mate, pea ʻoku nau vahevahe ʻa e tuʻunga tatau ʻo e faʻahinga fakamoʻoni ʻo e fakaʻauha. ʻOku fakaʻaongaʻi ʻeni ʻi he ngaahi ngaueʻanga ʻoku fakahehema ki he afi mo e ngaahi fakatuʻutamaki, hangē ko e kemikalé, tokonaki mo e fefonongaʻakí, fakafaitoʻo, ngāue fakakautaú, mo lolo fokotuʻu sectors. Neongo ia, Mahalo he ʻikai mahino kakato ki he tokolahi ʻa e faikehekehe ʻi he keipolo ʻo e kalava tafe mai mo e ngaahi puha fale. Tuku muʻa ke u fakamahinoʻi atu honau ngaahi faikehekehé.
Ko e tefitoʻi faikehekehe ʻoku ʻi heʻenau fakaʻaongaʻi mo e tuʻunga ʻoku lele lelei. ʻOku fakaʻaongaʻi ʻa e kalava tafe mai keipolo ʻo e fakaʻauha ʻi he taimi ʻoku fuʻu loloa ai ʻa e fakauaea, ʻai ke faingataʻa hono filo ʻi ha founga, pe ʻi he taimi ʻoku lahi ai e ofeʻingofua mo e divergences ʻa e fakauaea. ʻOku nau tokoni ʻi hono tokoniʻi e fehokotaki ʻa e ngaahi hala fakauaea faingataʻa ko ʻeni.
ʻI he tafaʻaki ʻe, ʻOku ngaue ʻaki ʻe he ngaahi puha fale ʻo e fakaʻauha ha taumuʻa kehe. ʻOku fakaʻaongaʻi kinautolu ʻi he feituʻu ʻoku fakauaea ai ʻa e ngaahi fehokotakiʻanga, tufakiʻanga nāunaú, pe meʻangāue fakaʻuhilá ʻoku fie maʻu ki ai ha nofoʻ. ʻOku faʻa haʻu ʻa e ngaahi puha fale ko ʻeni mo e fetuʻutaki feituʻu pea ʻoku faʻa lava pe ke fakatahatahaʻi ke faingofua hono fakaʻaongaʻi.