On Apr 13, 9:33 pm, wrote:
Can I use a sawzall to cut out a new construction window through the
fin (alum)? I don't want to destroy the trim or remove siding when
putting in replacement windows. Perhaps there is another tool that is
easier?

Yes. I'm not a big fan on relying entirely on caulk for a weather
seal. I don't know what type of windows you have, but I prefer
replacement sash to replacement windows in most instances...as long as
the existing window isn't horrible.

R