I should have said get noisy due to less air flow thus the fans run hotter as they run faster with less airflow and the bearings stuff up faster.
On Fri, 2002-11-01 at 23:51, Doug Foskey wrote: > On Fri, 1 Nov 2002 22:42, you wrote: > > 1. make sure there is a clear path for the air....if there isnt a clear > > path through the box you end up with a air pressure in-balance causing > > the fans to work harder and so they are noisy. > > Actually, fans rotate faster in a partial blockage due to the blades running > in less air, therefore less friction. (This is why when you put your hand > over the end of a vacuum cleaner, the revs increase.) > As a rule the plain bearing fans are quieter than ball bearing fans, until > the oil dries out, then noisier. (you can oil fans by peeling off the sticker > in the centre of the rotor, removing plug, then 1 drop of silicon oil. Do not > overoil.) > The more expensive fans have better designed blades. the Pabst fans have > blades that reduce the tip flutter for instance, so they run more quietly. > Doug -- ******************************************************************** * Hey if you're going to get mad at me every time I do something * * stupid, then I guess I'll just have to stop doing stupid things! * ******************************************************************** -- SLUG - Sydney Linux User's Group - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
