Ƙofar wuta ta ƙarfe tana cike da kayan wuta, kuma dole ne a fesa samanta na waje don cimma daidaitattun launi. Ƙofofin wuta na ƙarfe duk suna buƙatar bayyanar santsi, kuma fesa electrostatic ya cimma wannan. Fassarar da aka fesa yana da kyawun siffa mai kyau, mannewa mai kyau, da ɗan gajeren gini zuwa lokacin ƙirƙira, wanda ke rage girman lokacin gini da ƙarfin aiki.

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