American Science and Surplus sells stainless steel screening that is used for
holding flasks over Bunsen burners. Cost is 2$US for a 6x6inch piece, but this
should be available from any chemistry supply house. It looks very good when
used to cover a "passive" vent that is visible.
However, if used to covering fan driven intake or exhaust ports, it will
whistle or have a loud "rushing" sound. This would probably happen with any
screen whose holes were less than 1/8 inch. I've used it to cover "passive"
vents in a number of computers; it's tough stuff that looks good and really
helps to tame computer RFI. If your going to use a screen type material with a
fan, test it first. Blower noise is bad enough, but fan noise with a whistle
will drive you up the wall!
Hardware cloth or thicker aluminum venting material shouldn't have the "noise"
problem.
Jim K9JFK
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