Another source of nice air filter foam material is from the air filter 'sock' they use on dirt motorcycles. Your local motorcycle dealer should have both aftermarket and OEM filter 'socks' of different types. This motorcycle air filter foam material might be about the right thickness too.
I think the coarse aluminum grill you have in the filter frame was intended to keep the thin foam in place, give the whole filter assembly some integrity, support the foam filter material and keep it all flat.
I'd also think twice about using abrasive pad material like Scotchbrite as an air filter.
tom jobe...
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On 11/12/2018 10:42 AM, Bruce Lane wrote:
Many early air filters were made from a type of plastic foam which
degraded and decomposed over time, essentially turning into (very messy)
powder. The 502 is most certainly from that era.
The good news: Replacement material is easily obtainable. Check in the
plumbing/heating section of your preferred hardware or home improvement
store for open-cell filter foam (most often used in air conditioners).
It's cheap, and can be easily cut and shaped to the required dimensions.
Keep the peace(es).
On 12-Nov-18 10:37, Vincent Trouilliez wrote:
Hi Group,
This is a highly technical question, PhD only please ! LOL
Here goes : I just bought meself a little type 502 classic Tek, love it.
However it came with no air filter, somehow. The square frame to hold it, is there, screwed, but nothing in it, somehow ! However it does have a coarse grill... which presumably doesn't filter anything, but at least keeps one from stuffing his fingers in there and getting them sliced by the fan blades... better than nothing.
<snippage>
