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[Solved] Anyone know what this might be for?
(programming.dev)
Top comes out on the roof:
Not sure what happens below. Haven't gone under the house to inspect. Seems like a vent that travels through the wall space, but unclear why it would do that.
Any ideas what its purpose is?
Since you've ruled out a lot of other things. My only thought is if you have a basement it could be the radon mitigation system.
No basement either, and radon mitigation doesnt seem to be a thing in Australia? I was wondering if it was for ventilating the under house area, but that just seemed odd.