緊急排出マンホール
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相談：緊急排出用マンホールを、点検用の通常のマンホールの代わりに使用してもよいでしょうか？
可能です。点検時の透光孔としても利用できます
なんて大きな壺なんだ、光が通る穴はないのか？缶の天井に人孔がない場合、人孔と採光用の穴の両方として利用できる：P
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