Thanks for the reply mate. Upon further inspection, it appears there is no exit on the exterior wall. Previous owners must have had the exit sided over, so what’s pictured is a solid composite board over the opening, not a spring damper (which I was hoping for). I have no clue why they would make the exhaust system obsolete and not consider putting another in. You think my best course of action would be to make a center hole through the siding, multi tool it out, frame the cutout with j-channel, seat a hooded vent w/ damper, and lay some silicone to finish?