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Hows about adding a small extension (addition) to the garage?
If that vent takes you to a suitable drain (and it probably does) you could add-on in that area (maybe), install the drain plumbing in a trench and in new concrete and wouldn't have to cut into existing concrete and tunnel anywhere. Put a single slope roof on it and call it good.
Use 2 X 6 framing, insulate, install a small heater.
I don't think the "urinal-only" is a good idea in this case, farts don't always turn out to be farts.
If that vent takes you to a suitable drain (and it probably does) you could add-on in that area (maybe), install the drain plumbing in a trench and in new concrete and wouldn't have to cut into existing concrete and tunnel anywhere. Put a single slope roof on it and call it good.
Use 2 X 6 framing, insulate, install a small heater.
I don't think the "urinal-only" is a good idea in this case, farts don't always turn out to be farts.
