Last Updated：2025/11/28
During the renovation, the technician discovered that a fire damper in the ceiling duct was corroded and needed replacement.
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During the renovation, the technician discovered that a fire damper in the ceiling duct was corroded and needed replacement.
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改修工事中に技術者は天井のダクトにある防火ダンパーが腐食して交換が必要であることを発見した。
