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Masonry over a fireplace opening will be supported by a lintel of noncombustible product. The minimum required bearing length on each end of the fireplace opening will be 4 inches(102 mm ). The fireplace throat or damper shall be located not less than 8 inches(203 mm)above the lintel. Dampers shall be set up in the fireplace or the chimney venting the fireplace, and shall be operable from the space consisting of the fireplace. Smoke chamber walls will be constructed of solid masonry systems, hollow masonry systems grouted strong, stone or concrete. The total minimum thickness of front, back and side walls shall be 8 inches (203 mm) of solid masonry. Where a lining of firebrick not less than 2 inches (51 mm)thick, or a lining of vitrified clay not less than 5/8 inch(16 mm)thick, is supplied, the overall minimum density of front , back and side walls will be 6 inches(152 mm )of solid masonry, consisting of the lining. Vitrified clay linings shall comply with ASTM C315. The within height of the smoke chamber from the fireplace throat to the start of the flue will not be higher than the within width ofthe fireplace opening. The within surface area of the smoke chamber shall not be inclined more than 45 degrees(0.
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Where the within surface area of the smoke chamber is formed by corbeled masonry, the walls shall not be corbeled more than 30 degrees(0. 52 rad )from vertical. Masonry fireplace hearths and hearth extensions will be built of concrete or masonry, supported by noncombustible materials, and strengthened to carry their own weight and all enforced loads. Where the fireplace opening is 6 square feet(0. 6 m2 )or bigger, the hearth extension shall extend not less than 20 inches (508 mm)in front of and not less than 12 inches(305 mm)beyond each side of the fireplace opening.
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Wood beams, joists, studs and other flammable material will have a clearance of not less than 2 inches( 51 mm)from the front faces and sides of masonry fireplaces and not less than 4 inches(102 mm )from the back faces of masonry fireplaces. 12. Also Found Here noted and labeled for usage in contact with combustibles in accordance with UL 127 and installed in accordance with the manufacturer's guidelines are.