Wektu tahan geni saka lawang geni Kelas A ora kurang saka 90min, lan ana baja lan kayu. Interior lawang geni Kelas A umume digawe saka perlite, lan jumlah cilik saka bahan refractory kayata vermiculite Papan fireproof, umpluk Papan inti lawang, MC bahan fleksibel, etc.

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