Oge nkwụsị ọkụ nke klas A ọnụ ụzọ ọkụ abụghị ihe na-erughị 90min, ma enwere ígwè na osisi. A na-ejikarị ọnụ ụzọ klaasị A na-eme ọnụ ụzọ ọkụ site na perlite, yana obere ihe na-eme ka ọ bụrụ ihe na-eme ka ọkụ dị ka vermiculite fireproof panel, ụfụfụ ọnụ ụzọ isi mbadamba, MC mgbanwe ihe, wdg.

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