yeah, since your using the speaker box.
like i said earlier, paint the inner walls white. who cares what paint you use. white is white.
you can pick up 2 pc fans from any computer repair shop for 5$ or even free,
install one on one side of the box rotating clockwise,,
the other one on other side of the boxing rotating the other way.
that way, one fan brings in clean air while the other sends it out.
your lucky, i wanted to try the pc fan idea long time ago when i first started.
sadly, i didnt have any rooms/containers small enough.