Gabaɗaya akwai nau’ikan ƙimar wuta na ƙofar waje guda uku, waɗanda sune Class A, Class B, da Class C. Lokacin juriya na wuta na ƙofofin Ajin A ba kasa da 1.5h ba, lokacin juriyar wuta na ƙofofin wuta na Class B ba kasa da 1h, kuma lokacin juriya na wuta na ƙofofin wuta na Class C ba ƙasa da 0.5h ba.

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