An raba kofofin wuta zuwa maki uku bisa ga lokacin juriyar wuta. Lokacin juriyar wuta na Grade A Ƙofar wuta ta ƙarfe ba zai zama ƙasa da sa’o’i 1.5 ba; Lokacin juriya na wuta na Ƙofar wuta ta Karfe B ba zai zama ƙasa da awa 1.0 ba; Lokacin juriyar wuta na Ƙofar wutar ƙarfe ta Class C ba zata kasance ƙasa da awa 0.5 ba.

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