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Section 512 Subslab Soil Exhaust Systems
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Subslab soil exhaust system duct material shall be air duct material listed and labeled to the requirements of UL 181 for Class 0 air ducts, or any of the following piping materials that comply with the International Plumbing Code as building sanitary drainage and vent pipe: cast iron; galvanized steel; copper or copper-alloy pipe and tube of a weight not less than type DWV; and plastic piping.
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Mechanical Code 2018 of Maryland > 5 Exhaust Systems > 501 General > 501.3 Exhaust Discharge > 501.3.1 Location of Exhaust Outlets