The frame is tough and well-made, and the shutters are even linked together (they close by gravity, no spring). I ended up not using it because it's too big, at 9 inches square. It could have been 2 smaller both ways pretty easily; but if you have enough space, it seems great. It has no bug/rodent screen, but there's enough room to screw or glue in your own....
Rating: [4 of 5 Stars!]