Abubuwan da ke hana wuta da aka cika a cikin ganyen ƙofa na ƙarfe mai hana wuta ba su da ƙazantawa da ƙazanta. Tsarin jiyya na farfajiyar ganyen kofa shine fesa foda ko murfin PVC, waɗanda suke balagagge matakai masu dacewa da muhalli. Dangane da juriyar wuta daban-daban na ƙofofin wuta na ƙarfe, juriyar wutar su za a iya raba su zuwa maki uku: A, B, da c. Ana iya amfani da kofofin wuta na ƙarfe na maki daban-daban a wurare daban-daban.

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