how big of an operation are you doing?
im doing a closet grow that is about 2.5deep x 4wide x 6tall.
ive been growing in there for several months now and just built a carbon scrubber.
anyway, my point...you may not need ventilation if you open it up regularly.

im kinda in the same boat as you...cant drill and a window is too far away.
so i said funk it.
i dont know what your set up/security is like...but just a thought.
there are ways around it.