Wektu tahan geni saka lawang geni baja kelas A ora kurang saka 1.5 jam, lan syarat iki bisa diarani lawang geni kelas A. Kelas A interior lawang geni umume nggunakake perlite, jumlah cilik saka bahan refractory kayata Papan geni vermiculite, umpluk lawang piring inti, MC bahan cecek, etc.

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