I have 2 metal casement window frames in my foundation size 16" x 31". The glass and glass sash are gone and someone put cement board in the frame to fill the hole. where could I find replacement sash here in south eastern N.H. so I can get air and light into the dungeon I'm turning into a finished livable space
That sounds like a standard or close to standard size. You should be able to get an entire new window at any lumber yard or home center. They may be able to get you just the sash too so you don't have to pull out the old frame which is I'm sure what you would like to do.