How You know you have negative or positive pressure. Tags: Fan Systems Last response: April 15, 2014 10:51 AM in Systems Share Sage Connel April 14, 2014 11:19:10 PM I can say I know I have negative pressure. I unplugged one fan while the rest were spinning, and it slowed down then reversed direction as the air came down through it and was being pulled out by the other fans. More about : negative positive pressure Gam3r01 April 14, 2014 11:25:13 PM Just for future advice, dont move/remove any connections while the power is on. As for the pressure the easiest way to know is just to count intake v exhaust. More intake, more positive and so on. m 0 l i7Baby April 14, 2014 11:37:19 PM Or use a Static Pressure gauge m 0 l Can't find your answer ? Ask ! Get the answer thespaceduck April 15, 2014 12:03:06 AM If anyone in your proiximity smokes just ask them to blow a bit of smoke in the direction of the fans. Just make sure you dont get too much smoke in there m 0 l Sage Connel April 15, 2014 10:51:52 AM yeah I know it wasn't the smartest.....but I still thought it was cool xD m 0 l Can't find your answer ? Ask ! Publish Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !