Product review (5 stars): Perfect fit and so easy to install
Perfect fit and so easy to install; it took less than 5 minutes.  Keep in mind that it doesn't come with hardware to install though, but we were lucky enough to have supplies on hand.  You will need 4 very skinny nails or screws and consider using caulking to seal the perimeter.  Such an upgrade from the metal builders grade one that was on our home before.  Love that it keeps out the critters with a flap and the plastic grate!