Mantel shields - anyone know the regulations?

Does anyone know the particular regulations for mantel shields? Required dimensions? My stove is a bit too close to my mantel. I tried it without a shield and it is getting a bit too toasty for my liking when I run her up around 600 degrees. I have been playing around with temporary shields from

curious but how good is the shielded heart relic? [i find it being destiny 2 icefall mantle, functions just like the exotic] : r/remnantgame

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It has been announced that there is a new Punisher Series from Marvel Comics , But it will not be Frank Castle.The New person taking the mantle is a retired Shield Agent

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