NEW STEALTH BOX IDEA!!!
This one is for people with cats...
It's a cat tree/condo that doubles as a grow box.
Front view:
Cat condo things on the top and bottom. Scratching area in the middle.
Back view:
secret door on the backside of the scratching area. Fans can vent through the top or bottom into the cat condos. (Filters will be used of course)