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    1. BaconTreasurer on

      For that one, looks like it’s there to protect the drainpipe.

      Edit: This was wrong. Unironically_Dave and drunkenf gave right answer, it is ventilation for district heating.

    2. I’m pretty sure they are related to the district heating (kaukolämpö). Not sure what the exact function is. Maybe ventilation or something.

    3. iamnotyourspiderman on

      If I recall correctly, the old saying goes „anything is a butt plug if you are brave enough“.

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