The window used in this shower is a Marvin product. Marvin has detailed installation instructions available online.

I hope this helps,
Please take a look at our web site to see more of our work, http://www.dvrasmussen.com

Vote for your favorite of the bathrooms built by Rasmussen Construction at https://www.houzz.com/discussions/what-is-your-favorite-bathroom-that-we-have-built-dsvw-vd~628249

This bathroom won Best Professional Bath Space on Remodelista.com take a look at it at this link.
>>>> http://www.remodelista.com/posts/best-professional-bath-space-winner-chambers-chambers-architects

See the exterior before and after of this project at https://www.houzz.com/discussions/quite-the-redo-dsvw-vd~644308

Outstanding! Beautiful, crisp and functional. Kudos!