Exhaust

what can I use to to replace this so I can run my exhaust out ? Without cramming it through the crack

What are the dimensions of the window?

Yeah dimensions and if you can remove it would be good info.

If you can remover the louver you may be able to find a galvanized register boot to fit the opening. If not you could find someone to bend up one.

I would remove the window, and cut a piece of particle board to fit the opening.

paint the outside black and mount a vent in it. I seal mine with expanding foam because it is sturdy.

I had to do the same thing in my basement. I removed everything I could then plywood inside outside with insulation in the middle. Picked up some 4” exhaust fittings and it worked great.