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