Section M1502 IRC
Section G2439 IRC (Applicable to Gas Dryers)
FBC Residential
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Code Reference |
Area or Item |
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M1502.1 |
Ducts should be installed per manufacturer |
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M1502.2 |
Duct system independent |
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M1502.4.2 |
Duct Installation |
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M1502.3 |
Exterior Duct Termination |
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G2439.3 |
Exhaust installation requirements |
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M1502.4.1 G2439.7.1 |
Duct material and size requirements |
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M1502.4.5 G2439.7.4 |
Dryer Vent Length Length is based on code or manufacturer’s instructions. Sections 2439.7.4.1-3 note options |
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M1502.4.7 G2439.7.6 |
Exhaust duct mandatory |
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M1502.4.3 G2439.7.3 |
Dryer connectors or transition ducts |
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G2439.6 |
Protection requirements |
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G2439.2 |
Fire rated duct penetrations |
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M1502.4.4 G2439.4 |
Power Ventilators |
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M1502.4.5.3 G2439.7.4.3 |
Power Ventilator Length Requirements |
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G2439.5 |
Make up air (gas dryers) |
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FL Exception! PVC can be used under slab construction as an approved material. |
Reduction table for elbows and fittings
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DUCT FITTING TYPE |
REDUCTION LENGTH |
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4 inch radius mitered 45-degree elbow |
2 feet, 6 inches |
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4 inch radius mitered 90-degree elbow |
5 feet |
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6 inch radius smooth 45-degree elbow |
1 foot |
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6 inch radius smooth 90-degree elbow |
1 foot, 9 inches |
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8 inch radius smooth 45-degree elbow |
1 foot |
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8 inch radius smooth 90-degree elbow |
1 foot, 7 inches |
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10 inch radius smooth 45-degree elbow |
9 inches |
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10 inch radius smooth 90-degree elbow |
1 foot, 6 inches |