511.2 Exhaust outlets.

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 Thickness		Termination				Clearance
	Walls (inch)	Lining	Above roof opening (feet)	Above any part of building within (feet)			Combustible construction (inches)		Noncombustible construction
				10	25	50	Interior inst.	Exterior inst.	Interior inst.	Exterior inst.
High-heat appliances (Over 2,000°F) a	0.127 (No. 10 MSG)	4 1/2" laid on 4 1/2" bed	20	—	—	20	See Note c
Low-heat appliances (1,000°F normal operation)	0.127 (No. 10 MSG)	None	3	2	—	—	18	6	Up to 18" diameter, 2" Over 18" diameter, 4"
Medium-heat appliances (2,000°F maximum) b	0.127 (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).

Section MC 512: Subslab Soil Exhaust Systems

512.1 General.

Where a subslab soil exhaust system is provided, the duct shall conform to the requirements of this section.