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Ọnụ ụzọ nyere ọkụ elekere 1

The fire resistance time of Class B steel fire door shall not be less than 1.0 hour, and the hardware fittings used on the fire door must also be fire-resistant hardware fittings.

Ọnụ ụzọ nyere ọkụ elekere 1-Ụzọ ZTFIRE- Ọnụ ụzọ ọkụ,Ọnụ ọkụ na-ekpuchi ọkụ, Ọnụ ụzọ ọkụ ọkụ, Ọnụ ụzọ na-eguzogide ọkụ, Ọnụ ụzọ ígwè, Ọnụ ụzọ ígwè, Ọnụ ụzọ ọpụpụ