![Automatic American Coolair Shutter](http://perfectgreenhouse.com/cdn/shop/products/2014-04-09_15.08.55_1024x1024.jpg?v=1502997461)
The Perfect Greenhouse
Automatic American Coolair Shutter
$274.24
Outside Dimensions for 16" x 16" - 19.25" x 19.25"
Outside Dimensions for 21" x 21" - 24.25" x 24.25"