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the pwm wire is what controlls the speed of the fan so you will need to connect ths to the 12v to for it to work

Thanks every one im going to be doing a pc grow for my first one with northern lights hope it goes well

hi every one im not new to this but has been about 10years since i have grown any thing. alot has changed when i use to grow so will be keeing a eye out and catching up on stuff