Check out the ELAN ZFan. VERY NICE, and small, quiet!
Try www.pcpowerandcooling.com 20db fans. You will need to go to Radio Shack and buy a AC to Dc convertor that can power as many fans as you need. The one I purchased cost 29.99 and runs 4 fans with no problem. The fans are 8.00 each shipping included. Simply plug in the converter and run the red wire from the fan to the red input on the convertor and do the same with the black wires. You will need to splice some wire to each side to make it the correct length for your installation.
Bob the reasoning is so as to not introduce thermal stress points due to larger temperature differentials across a small heat-sinked area. Cold air blowing directly onto component causes a much larger thermal stress differential over a smaller area, with corresponding variations in semiconductor operating temperature, vs. drawing the colder air across a larger thermal area via drawing heat away from the heat sinked area.
Similar issues are noted when using glassware; thermal stresses occur across an even smaller glass area of a tube envelope vs. drawing the heat away.
Bob Bundus, so what you are saying is that LESS cold air is is introduced by induction than by forced draft? Remember that the harm air has to be replaced by something (i.e. cold air) for the cooling of the compenents to occur. The more warm air that you remove the more cold air moves in to replace it. Frankly I don't think that it makes any difference, unless the air is really cold and then either method will be bad.
Salut, Bob P.