Last year I rebuilt a Woodstock Fireview that was sitting in a leaky barn or shed since 1998. The stove was pretty much a rust bucket but was never fired. The ceramic cat was in good shape and fired up just fine.
Is a catalyitic stove really more efficient since a cat looses its efficiency with age
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Reporting for duty!
And no, improper storage is unlikely to damage the cat. The active coating is precious metal, Pd/Pt/Rh or thereabouts, that doesn't degrade. The shell of a steel cat is likely some high-temperature stainless steel, a standard carbon steel wouldn't stand up to the operating conditions anyway, so I would not be worried there, either.
You can, however, deactivate the cat by depositing debris on the active surface. So if you're storing your cat unpackaged in a sawmill shop with lots of dust flying around, it may not like that. But if it's just sitting in a cardboard box on a shelf somewhere in the basement, that won't degrade for decades.
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