LG Hydrogen Tank weird Airtightness
From the shape and function of the Large Grid Hydrogen Tank follows that one segment of the curvy part could be inside of pressurized room, while other segment can be 'outside' - or inside other pressurized room that does not share air with first one.
However air flows through these curvy segments, so it is not possible to seal room with one segment of the tank.
It is because only some outer faces of the tank are airtight.
Proposal: allow also inner faces of the tank to be airtight.
Similar block is LG Small Atmospheric Thruster, however from it's function it is clear that air should flow through it, so it cannot be used to close some room airtight with intake being 'in the room' and exhaust 'outside' (or swapped).