new windows

[tasmith]

Putting carport on side, and will box in for windows. What opening dimensions do I use for framing. The Pella book list's a Frame width and height, and a opening width and height, (which is larger). Example: Frame width=3'6"frame height2'11"; Opening width 3'6-3/4", Opening height2'11-3/4". I am setting 4x4 post's and would like to center them with the proper spacing.

[HayZee518]

Use the opening width. This way when you get to install you may have to shim up or sideways for plumb and level. The windows fasten to the sheathing.