i made a 20 gallon rubbermaid box with 6 23 watt cfl and had one 90 cfm computer fan on the top and had 2 passive intakes on the bottom on either side and it was ok if the house stayed at or below 80 degrees, anything above it got a little hot in there. so you might want to put 2 fans on it and make sure you have some vent holes the same size as the fans, or more smaller holes.