We were discussing on another forum and something else came up. With the exception of wood racks (which I would recommend you don't use), most racks including melamine are somewhat fire resistant. The issue is if you have Flexwatt or heat cable overheat or short and it starts arcing, you don't want anything flammable near it. We all probably have something VERY flammable we keep in our snake rooms - bedding. I know I keep a large bag of aspen back there all the time. It doesn't take much to light shredded aspen, just a few sparks. Plus it's packaged in a paper sack. I'm going to start storing it in a metal trash can with the lid on.