Alesan kanggo tahan geni lawang geni banget prasaja, utamané nggunakake bahan non-combustible anorganik liyane saka baja, kayu refractory utawa produk kayu refractory. Lawang geni mung nduweni peran sementara kanggo nglawan panyebaran geni, lan wektu tahan geni tartamtu gumantung marang ketahanan geni bahan lawang geni lan pengisi.

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