Actually you are going to end up DECREASING your cfm efficiency and here's why:
Adding another fan, especially a mismatched one, is going to add TURBULENCE to your duct system and acutally BLOCK air flow. Clear, straight, smooth ducting is best, with just a SINGLE fan. By the same token, if you have an active exhaust AND an active intake, the fan cfm must be perfectly matched, or you're actually better off just running an exhaust fan to PULL air through the whole system, leaving anice big unobstructed intake hole- preferably in a cool area. If you can bring cool air up from the basement via an unused chimney, or from and iar conditioned room via a duct, that would be nice.
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