Masonry fireplace and chimney construction is regulated by the building code. Unlike UL or some other "listing" the building code is not proprietary. The sections which regulate residential construction are "prescriptive" so that they can be understood and followed by a contractor or craftsman without needing to hire an engineer.
The several "model codes" used in the United States (BOCA, NFPA, UBC and SBCCI) have all being merged into one new International Building Code (IBC) and it's residential counterpart, the International Residential Code (IRC). This has been a major ten year long effort and now the 2006 IRC is in print. The part that regulates fireplaces and chimneys - is CHAPTER 10, CHIMNEYS AND FIREPLACES.
In addition to the building codes, most states and some local jurisdictions and once in a while the federal government sometimes adopt or enact various energy, indoor air quality and emissions regulations, all of which are generally enforced by the building official. Many of these regulations, insofar as they impact masonry fireplace and chimney construction, are on line linked from the "code" page.
42" Rumford with folding metal doors
Important code Changes:
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Buckley Rumford Fireplaces
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