Dryer Vent Code References
M1502.2 Concerning Duct Terminations
M1502.3 Concerning Duct Sizes
The diameter of the exhaust duct shall be as required by the clothes dryer’s listing and installation instructions.
M1502.4 Concerning Transition Ducts or Flex Hoses
Transition ducts shall not be concealed within construction. Flexible transition ducts used to connect the dryer to the exhaust duct system shall be limited to single lengths not to exceed 8 feet and shall be listed and labeled in accordance with UL2158A.
M1502.5 Concerning Duct Construction
Exhaust ducts shall be constructed of minimum .016 inches (0.4mm) rigid metal ducts, having smooth interior surfaces, with joints running in the direction of air flow. Exhaust ducts shall not be connected with sheet metal screws for fastening.