honorelsu Posted October 24, 2005 Posted October 24, 2005 I Found this here: http://www.7volts.com/quiet.htm Great Article The Ring Cage "The Augmented Fan is a new, low noise fan technology that allows for a 40-50 % increase in flow @ equal noise levels. The Augmented Fan’s difference in operation can be observed with the addition of a patented multiple ring structure or ringcage. The ringcage acts as a radial flow ejector in combination with an axial fan. Utilizing the normally-wasted energy in the fan tip vortex the Augmented Fan induces added air into the normal propeller flow. The added inflow through the rings destroys the tip vortex and helps maintain boundary layer control; the smoother flow through the system eliminates fan duct stall and reduces noise 6 - 8 dbA." quoted from Interesting paper at http://home.att.net/~alemont/noise2.html Panasonic's Application of LAC Augmented Fan Technology. If you want to look, these are the Panasonic FBL series of axial fans. They have been listed in the past but the listing I had has been removed. I don't know if these are available. Tom McFadden writes: I dropped by to link to your photo of an FBL fan, and if you were not already aware of this, people can get them from Digikey.com. Search for "fbl fan" at Digikey and filter for size/voltage needed, and bingo! They also carry the standard FBA-family Panaflos and even have a slimline 80x15mm L1A for people with wacky power supplies. Not cheap, but hey. CPU Fans CPU fans and heatsinks are covered in some detail on the cooling page. Share this post Link to post Share on other sites More sharing options...
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