Lawang geni diijini duwe jendhela, umume disebut jendhela observasi. Nanging, jendhela ing lawang geni kudu digawe saka kaca tahan geni, ukuran jendhela, perawatan peserta karo lawang geni, lan struktur mbukak lan nutup jendhela kudu strictly sesuai karo peraturan geni. departemen.

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