Post #805948 by MadDogMike on Tue, Oct 11, 2022 8:43 AM

Not saying it's a good idea but the flash point for cotton (temp at which it catches fire) is about 410F, I doubt that your ducts are that hot. If you can hold your hand to it for a few seconds it's well under 200F. You could also hang your net so it's a few inches from the duct for extra safety and/or use fire retardant.

You can buy barnacles and glue them to magnets using high temp glue (epoxy?). Or have some made from ceramic if you know a guy (I have actually made fake ceramic barnacles and I work for cheap - like cost of materials and postage). Shells, ceramic, and metal are all materials that would work well in your net with no danger of damage.