Thanks for the reply. I fixed the revving up and down problem. I ordered a 110v to 12vdc converter that puts out 5amps and the fan is blowing like a hurricane now. Just needed more amps. Old converter only had 1 amp.

Hey....thanks for much!!!!!!!!!! You gave me good info to work with. Took me awhile but I wired it all......and it works!
Whew!!!!!!
Thanks!!!

Could someone please tell me how to wire these three things together??
Case fan
110v to 12vdc converter
speed controller
I tried but I don't have a clue how to wire these. This isn't intended for use in a pc.
Thank You!!!

I really appreciate you taking the time to explain this to me! Very good info! Good idea about checking the 12Vdc source. I will be ordering one of those Noctua fans. Thanks again!!!!!!!

OK thanks but....if that's the case then why does my 4-wire 250cfm fan rev up and down with only the red and black wires hooked up? I just don't know exactly what type and name of fan that I should order to get around this problem.

Thanks gents! Great info. I just want the fan to run full speed all the time. I'll shut it on and off with a remote. So again....will a two wire 250cfm fan run at it's highest speed off the 12v converter, without revving up and down?? Will a three wire fan do the same only wiring the black and red w...

Thanks for the reply. So....if I am understanding this, I would be safe with a two pin fan that would run at it's highest rpm constantly? I'm using a converter 110v to 12v. I am using another pc fan 125cfm on the same converter and it runs without it revving up and down. Thanks!

Can someone recommend a pc fan with 250 CFM that runs at ONE speed? I already bought one but it keeps revving up and down. The fan will be used for a homemade air filter system.
Does a 3-wire fan mean it only runs at one speed?
Your info is appreciated!!!! Thanks!