"Phil Anderson" wrote in message
news:uoiZa.74573$Oz4.17482@rwcrnsc54...
I would just as soon start out by completely
replacing the puppy with something quieter, i.e., better
bearinged, as you advise.

Be aware that the bearings are not the only thing that make a noise. The air
flow itself is a major factor. Papst and others make fans with different
CFM ratings (cubic feet per minute) and corresponding SPL levels, for the
common sizes.

Temperature sensitive electronic fan speed control, is usually the best
option though.

TonyP.