Humidity Control?

[TheReefGeek]

I didn't know there might be some space there, my basement has a finished roof, but I have some access panels, I will poke my head in there tonight and see what I can see.

I would need a reciprocating saw to do that job, one of the few saws I dont own yet, but could probably buy one for the same price as renting the drill I thought I would need.