I have a rubbermaid grow box try increaseing your intake air flow, I use a 4" in line duct fan for exhaust with carbon scubber and keep temps around 70 to 75 deg.
Big len Reviewed by Big len 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