Bathroom is located in a corner on the main level of a two level house. It has close access to 2 exterior walls that could potentially be vented through. That would be a good option and I would just not use the existing ducting.

I’m in the Pacific Northwest, in Vancouver.

It’s a Panasonic one with options for 50-80-100 cfm. Bathroom isn’t very big, about 50 sq. Ft.