This will tell you the size mesh, probably. The states out here all use this.
http://www.fs.fed.us/t-d/programs/fire/spark/chainsaw.html
Madsens has the real stuff for sure and it is pretty inexpensive to buy. The shipping would be more than the mesh piece.
It is required to have it during fire season here.
nothing comes up for anything stihl, MS, 660 ext...?
cant find anything at Madsens either?
I pullem off.
You'd get sent home around July then.
Check out tobacco shops or "other" smoke shops for pipe screen. It's about the same stuff.
If your talking of mesh for ported mufflers, see below.
Federal permitted mesh size:
http://www.fs.fed.us/r6/w-w/passes/firewood.shtml
Saw: Exhaust system in good repair. Screen-type spark arrestor of 0.023" mesh or less, qualified under US Forest Service standards.
http://www.amazon.com/Stainless-Steel-Type-Mesh-Diameter/dp/B001CTV5WU
#30 mesh has an opening of .021"
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