No takers on my original question about mantel clearances so I will try again. I found the below attached NFPA 211 clearances on a stove mfg site. I do not know if the typos (% instead of ") comes from NFPA or the mfg. Anyhow, nowhere is there guidance on clearance to a wood MANTEL. A mantel is not a wall, and I do not think it is a ceiling either. Its wood so its combustible, but I still can't figure it out. It appears as though with proper shielding clearances to a ceiling can be reduced by 50%, but may not be less than 18" I would hope a wood mantel, which is not a ceiling, can be closer than 18". My stove spec is 24" to a mantel, so with shielding I would think 12" (50%). But that is less than 18". But its not a ceiling, so..... There are plenty of threads on this topic and posts with pictures which is helpful, but no answers as to code and NFPA 211. If you dropped a plumb line off the edge of my mantel it would probably overhang 1/3 the depth of my stove.