Wektu proteksi geni saka lawang geni yaiku 60/90/120min. Lawang geni biasane dipérang dadi lawang geni kayu, lawang geni baja, lawang geni stainless steel, lawang kaca geni lan lawang mlebu geni, apa iku kayu, baja utawa bahan liyane. Ana telung kelas, A, B, lan C.

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