Im with jbrand. I use speed controllers all the time for vortex type fans. They work perfectly for this type of application. Install the speed controller on the larger of the two fans and then reduce the larger fans speed to more closely match the smaller fans speed. Other then that, you will need to replace one of the fans so that the cfm's more closely match.
Prodaytrader Reviewed by Prodaytrader on . suction problem???? When I turn on carbon filter the suction is tearing the mylar off the wall... I have an intake fan 6 inch and out take fan is 10 inch... mylar is stapled down and taped...???? Rating: 5