Originally Posted by Ron6519
I haven't seen an aluminum window in years. Replacement windows don't generally convert to new construction windows. Something doesn't make sense.
You can have any "replacement" window ordered with the fins added, essentially making it a "new construction" window. One reason for doing this is that many models of new construction windows come with generic exterior trim as part of the window unit.
That said, I agree that something does not make sense. There would be no reason to order a custom size "new construction" window, and the remove the fins to use it as a "replacement", whether or not it has exterior trim. All you need to do is order the window as a replacement to begin with, and it will come without the fins. Also, a new construction window will not come with the spacer at the top...