Umnyango wensimbi ongenamlilo ungahlinzekwa ngefasitela, i-shutter, i-ventilation shutter, njll njengoba kudingeka. Ngokusho kokumelana nomlilo okuhlukile kweminyango yomlilo yensimbi, ukumelana nomlilo kungahlukaniswa ngamabanga amathathu: A, B kanye no-C.

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