I build sheds for a living and I use these windows on all my sheds. They are just the perfect size.

They are single pane and each come complete with grills and screen. The bottom portion slides up and down with a lock.

I searched for a long time before I found a manufacturer of a window this size for my sheds.

The rough openning for the window is 18.5" x 27.5".

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On Dec-13-08 at 13:05:08 PST, seller added the following information: