IF your light is air-coolable, I would swap out your fans so that big one is on the light. Also consider insulating the duct from the light to the fan.
Remove all obstructions from the passive intake and make it twice as big as the total exhaust hole size, including the exhaust from your light.
Make sure the exhaust from the light is not going into the space that the intake is pulling from. Send it into a different room.
A/C the room where your intake is coming from.
stinkyattic Reviewed by stinkyattic on . Heat-What I am doing wrong? Well I started to get heat problems with temps around 90 so I decided to add a 500 cfm exhaust fan at the top of my room to take out the heat. The problem is that it only made the temps go down like 2 degrees. Is this because I have no intake air or is my fan not big enough? My room is less than 800 sq ft. I have a 1000w light with a 180 cfm exhasut fan connected to it and the duct is very hot so I know its working. Instead of hooking up the new 500 cfm fan at the top of my room should I switch Rating: 5