Cutting through a thick wall
I am interested in retrofitting my house with either a ducted HRV or something like the Lunos e2. Problem is that I have no idea of how to cut through my walls. I have 2×4 walls but last year I re-sided with 4″ of XPS and a rainscreen system. So in total my walls are about 9.5″ thick. How do I cut a 5-6 inch circular hole in these thick walls?
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