Scale chain link fencing.
Just posted this on another board and thought some here may find it useful.
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It couldn't be simpler. All you need to do is go to your nearest auto parts store and tell them you want to see an air filter for a Chevy or GMC pickup with a 350 engine. There's two heighths with the short one about four inches and the tall one about six.
I used metal rod from Home Depot for the frame and gates with very fine solder to attach the mesh to it. It looks very much like the method used on the real fencing and is very easy to work with. Just loop it through the mesh and twist it on the rod. Check out a real fence and you'll see how easy it is. I soldered the top, bottom and cross bracing together before attaching the mesh but you could use epoxy as well.
I have access at work to Purolator and it works well but I've seen some Fram filters that look more like chain link with a relief type texture that the Purolator lacks. And the Chevy filter is one of the largest (more material) and cheapest of the filters. Win, win situation. Should be about seven or eight bucks for all the fence you need for most projects. If you use a good mask you can salvage a used one for free and it's already "weathered" but be very careful of the dust.