Ray wrote:

I am renovating my full bathroom (which already has a window in it)
and creating a powder room in an old closet that has a window that is
nailed shut. I'm having both windows removed. In the full bathroom,
I'm replacing it with a smaller window. In the powder room, I'm
replacing it with glass blocks and adding a vent.

I was asking the question because I've had two plumbers/contractors
in so far and one told me I needed both while the other said
either/or. I'm siding with the either/or guy.

Why not call the building inspector for the right answer for your community?

--
Ed
http://pages.cthome.net/edhome/