I put stilts on my wood stove just to not have to bend over to fill it. Just pieces of pipe slipped over the legs and set screws to make them snug, about 20" off the floor.
Hadn't heard of a requirement to do that though.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-