12×12 fire rated access door,double door fire doors,door ratings in rated walls

A na-ekewa ọnụ ụzọ ọkụ ígwè n’ime ụdị atọ ndị a: oge ​​nkwụsị ọkụ nke klas A ọnụ ụzọ ọkụ ígwè agaghị abụ ihe na-erughị awa 1.5; oge nkwụsị ọkụ nke klas B ígwè ọkụ ọnụ ụzọ agaghị erughị awa 1.0; oge nkwụsị ọkụ nke klas C ígwè ọkụ ọnụ ụzọ agaghị erughị awa 1.0. ihe na-erughị 0.5 awa.

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