Ƙofar wuta ta ƙarfe bisa ga juriya na wuta, aikin wuta ya kasu kashi A, B, C grade. Lokacin juriya na wuta na aji A Ƙofar wuta ta ƙarfe ba za ta zama ƙasa da sa’o’i 1.5 ba, lokacin juriya na wuta na aji B na ƙofar wuta ba zai zama ƙasa da sa’o’i 1.0 ba, kuma lokacin juriya na wuta na Class C na ƙofar wuta ba zai zama ba. kasa da 0.5 hours.

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