[Arny Krueger]

"Charles Packer" wrote in message

On Mar 29, 6:57 pm, "Arny Krueger"
wrote:
Bias setting shifting, and current drain growing?

There is a failure mode in fans where the bearing
friction increases, and the current draw goes way up.
Waaay up! I've seen a 12v CPU fan motor take out the
12 volt supply on a desktop PC. I saw this happen last
week. Most of those PC power supplies can put out 12
amps or more at 12 volts.

Yikes, this would call for immediate investigation.
I hope the fans are reasonably accessible when I
lift out the 50-pound behemoth from its shelf and
take off the covers.

If the existing fans run on 12 volts DC, the larger PC parts retailers like
Newegg have many options for attractive prices.