511.2 Exhaust outlets.
MC § 511.2
Outlets for exhaust that exceed 600°F (315°C) shall be designed as a chimney in accordance with Table 511.2. Table 511.2 Construction Clearance and Termination Requirements for Single-Wall Metal Dust, Stock and Refuse Conveying Systems Serving Temperature Range Minimum ThicknessTerminationClearanceWalls (inch)LiningAbove roof opening (feet)Above any part of building within (feet) Combustible construction (inches) Noncombustible construction 102550Interior inst. Exterior inst. Interior inst. Exterior inst.High-heat appliances(Over 2,000°F) a0.127 (No. 10 MSG) 4 1/2" laid on 4 1/2" bed 20 ——20See Note cLow-heat appliances(1,000°F normal operation)0.127 (No. 10 MSG) None32 ——186Up to 18" diameter, 2" Over 18" diameter, 4" Medium-heat appliances(2,000°F maximum) b0.127 (No. 10 MSG) Up to 18" dia. – 2 1/2" Over 18" – 4 1/2" On 4 1/2" bed 10 — 10 — 36 24 Up to 18" diameter, 2" Over 18" diameter, 4" For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, °C = ((°F) - 32)/1.8. a. Lining shall extend from bottom to top of outlet. b. Lining shall extend from 24 inches below connector to 24 feet above. c. Clearance shall be as specified by the design engineer and shall have sufficient clearance from buildings and structures to avoid overheating combustible materials (maximum 160°F).
