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// CODE SNIPPET

Section 512 Subslab Soil Exhaust Systems

Mechanical Code 2018 of Maryland > 5 Exhaust Systems > 512 Subslab Soil Exhaust Systems
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512.1 General

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

512.2 Materials

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.

512.3 Grade

Exhaust system ducts shall not be trapped and shall have a minimum slope of one-eighth unit vertical in 12 units horizontal (1-percent slope).

512.4 Termination

Subslab soil exhaust system ducts shall extend through the roof and terminate not less than 6 inches (152 mm) above the roof and not less than 10 feet (3048 mm) from any operable openings or air intake.

512.5 Identification

Subslab soil exhaust ducts shall be permanently identified within each floor level by means of a tag, stencil or other approved marking.

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