Lawang sambungan lawang geni sing luwih cedhak nduweni peran gedhe. Nalika lawang geni ditutup, lawang nyedhaki bakal langsung diaktifake, lan lawang nyedhaki bisa langsung ditutup, kang bisa duwe efek sealing kuwat lan èfèktif isolasi sumber geni. Lan iku relatif nyenyet.

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