My old shop was a “stick the hose out the garage door…” after my move, the new shop is in a spare bedroom and the Glowforge needed a window insert.
(After I made my design, of course, I searched the form and found some great/elegant/better designs)
Window is 30" wide so I had to overlap the two pieces of acrylic. I cut two slots and held the pieces together with a bolt and wing nut. It lets me expand the insert into the window frame. The white flange is just a friction fit.
Definitely not airtight, but seems to do the trick. I want to rig up a booster fan, but need to go digging for parts.
