I have yet to build my rubbermaid box BUT I believe you are using the bottom of the rubbermaid which encloses the box, don't use the bottom. You can see in some of Bodoms pictures, he's not using the bottom until, either it starts stinking or most likely when you have to 12/12 due to keeping out light.

Prop your stuff up with CD cases or books like in Bodoms pictures and it basically keeps the whole bottom as a passive intake. It should help your temps while vegging and all.
Balkey Reviewed by Balkey on . Rubbermaid help I just finished a rubbermaid growbox like many others here have built. Sorry, no pictures yet, but they're coming. I have six 26w cfl with a 4" inline fan and passive intake. The fan is the duct booster type (tiny fan inside a 4" metal duct) which supposedly pulls 65 cfm or 85 boosted. On my test run, temps inside the box reached 100 F. Ouch! Is it likely that a speed controller boosting the fan will be enough to control my problem, or should I resort to buying a different fan or run dual Rating: 5