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2113.11.2.2 Lining.
Masonry chimneys shall be lined with an approved medium-duty refractory brick not less than 4 1/2 inches (114 mm) thick laid on the 4 1/2-inch bed (114 mm) in an approved medium-duty refractory mortar. The lining shall start 2 feet (610 mm) or more below the lowest chimney connector entrance. Chimneys terminating 25 feet (7620 mm) or less above a chimney connector entrance shall be lined to the top.
2113.11.2.3 Multiple passageway.
Masonry chimneys containing more than one passageway shall have the liners separated by a minimum 4-inch-thick (102 mm) concrete or solid masonry wall.
2113.11.2.4 Termination height.
Chimneys serving appliances that operate at greater than 1,000°F (538°C) shall extend at least 20 feet (6096 mm) above the highest construction, such as roof ridge, parapet wall, penthouse, or other obstruction within 50 feet (15 240 mm) of the chimney outlet, whether the construction is on the same building as the chimney or in another building. However, such construction does not include other chimneys, vents, or open structural framing. Any chimney located beyond 50 feet (15 240 mm) from such construction but not more than the distance determined from Equation 21-2 and Table 2113.9, shall be at least as high as the construction.
2113.11.2.5 Clearance.
A minimum clearance of 4 inches (102 mm) shall be provided between the exterior surfaces of a masonry chimney for medium-heat appliances and combustible material.
2113.11.3 Masonry chimneys for high-heat appliances.
Masonry chimneys for high-heat appliances shall comply with the provisions of Sections 2113.11.3.1 through 2113.11.3.4.
2113.11.3.1 Construction.
Chimneys for high-heat appliances shall be constructed with double walls of solid masonry units or of concrete, each wall to be not less than 8 inches (203 mm) thick with a minimum airspace of 2 inches (51 mm) between the walls. Alternate chimney designs for high-heat appliances constructed with radial brick shall be permitted subject to the approval of the commissioner.

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