Saliyane fungsi lawang biasa, lawang geni uga nduweni fungsi khusus kanggo nyegah geni, pamisahan asap, pemadam kebakaran lan perlindungan evakuasi. Lawang geni mung bisa nyukupi syarat integritas geni sajrone wektu tahan geni sing ditemtokake, lan tingkat integritas geni yaiku 1.0h, 1.5h, 2.0h lan 3.0h.

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