OK. I just checked that I only need the 2 wire fan: "If you have a third blue wire on your fan (RPM sense) just cut it off as HeaterMeter does not provide RPM monitoring. A little heatshrink tubing makes a really nice connection." The F00 designation is for the tachometer wire. Delta does not list an R00 designation, but it could be a revision. The A version is two wire. I ordered the one from digikey.