How do I measure pressure inside computer case Answered
. I've setup a home file server and would like to be able to maintain positive pressure in the case to keep dirt out (two dogs in the house). I've cut some filters to fit the fans blowing into the case (front, rear, and side) and installed a "PCI slot" exhaust fan (it and the PSU are the only exhausts). All these are connected to a four-channel controller.
. Using the handy-dandy strip-of-paper-in-front-of-a-case-opening method, case pressure is real close to being equal to ambient with all intake fans on high and the exhaust fan on low (700W PSU has two fans that seem to work very well). Even under full-load, BIOS/SpeedFan says the 1.8 GHz Celeron temp stays below 140 degF under full load and idles in the mid-to-high 90s. HDD temps (2x400GB RAID 1 + spare and 40GB boot) stay below 105, except when formatting when they might rise to 110.
. I have some clear tubing, so I could rig up a manometer, but don't feel comfortable hooking up a water hose to my computer. Any ideas on a cheap-and-easy way to measure DeltaP (I'm guessing 0-5 inWC would work) without liquids? Could a automotive Manifold Absolute Pressure (MAP) sensor (I think they have a range close to 0-30 inWC) be adapted?
. Someone point me in the right direction and I'll post an Instructable when I figure it out.