Product review (2 stars): Disappointing design issues that weren't apparent in the product description or photos.
I liked the looks of this unit online, but I didn't install it. I have a log home. As such the exterior walls are slightly concave. The connecting piece that inserts into the wall on this was not of sufficient length to have an airtight/insect-proof seal. Another issue was that unlike the one I was trying to replace, the screw holes on this are not in a square pattern; the bottom 2 holes are slightly further from the sides than those on top.