I've moved to a new place and the upstairs is unbearably hot (mid-80s indoors upstairs, 70 downstairs where the AC thermometer is). Had an idea to use some 120mm case fans I have laying about (swapped for better ones in my rig) in a bracket inside the vent to pull air through the floor vents. I know sleeve bearing fans aren't ideal for horizontal mount, but they're leftovers. My question comes down to wiring this mess up. Since these fans are DC voltage controlled and I have some spare DC wall warts, is there any major issue with a setup drawing fewer amps than the power supply is rated for? Each fan is .16 A. The power supply is rated at 800 mA and 16 W, with adjustable voltage [up to 12V which would be full speed for the fans]. I was thinking along the lines of 4 fans in parallel, which would give me 640mA and 7.68 W when running full speed at 12V. Each fan is supposed move about 40 cubic feet/ minute, which will hopefully accumulate some meaningful amounts of cool air in my room.
Any major electrical issues with this set up (or my math)? I'm trying to keep this cheap, easy, and without additional materials, but are there any major things I need to add or adjust on this?
Thanks in advance.
