GMAN wrote:
In article , Jim Adney wrote:
On Sat, 28 Jun 2008 08:06:11 GMT (GMAN) wrote:
Anyone know where to find the foam material that is used for filters. The kind
you would use behind computer fans and the like to catch dust. I need to make
some custom filters for a few 120mm fans, Is there some place that sells it by
the sheet or rolls?
Hardware stores often have sheets of open foam filter material for air
conditioner filters. It's a couple square feet, about 1/8" thick, and
easily cut to size with scissors.
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I tried Home Depot and Lowes no luck. I will try around at some smaller stores
like ACE if i can find one locally. I cant believe its this hard to find the
stuff.
Did you look at the (cheap) furnace filters? Most HW stores sell the
very cheap fiber filters (e.g. blue or green fiber) for something like
$2 for a 20"x20" filter. You can take one of these apart very easily
because the frame is cardboard. The filter material is not very
restrictive to air flow. If you need more filtering capability, just
double the filter thickness. Things like vacuum cleaner bags and
exhaust fan filters are usually more restrictive to airflow because they
have the luxury of a very powerful fan motor and usually a high flow
rate. Fan flow rates for PCs are (usually) very low, e.g. 50-80 CFM, so
you don't want a filter that will be a high resistance to airflow.
-J