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// CODE SNIPPET

M1502.4.1 Material and Size

MA State Building Code, 9th ed, Residential Volume > 15 Exhaust Systems > M1502 Clothes Dryer Exhaust > M1502.4 Dryer Exhaust Ducts > M1502.4.1 Material and Size
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Exhaust ducts shall have a smooth interior finish and be constructed of metal having a minimum thickness of 0.0157 inches (0.3950 mm) (No. 28 gage). The duct shall be 4 inches (102 mm) nominal in diameter.

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