Oklahoma Administrative Code
Title 748 - Oklahoma Uniform Building Code Commission
Chapter 20 - Adopted Codes
Subchapter 6 - IRC[®] 2018
Section 748:20-6-20 - IRC[®] Chapter 15 Exhaust Systems

Universal Citation: OK Admin Code 748:20-6-20

Current through Vol. 42, No. 1, September 16, 2024

Chapter 15 of the 2018 IRC® is adopted with the following modifications:

(1) Section M1502.3 Duct termination. This section has been modified to add requirements for the exhaust duct terminate a minimum of 12 inches (305 mm) above the ground or any obstructions; terminate at least 3 feet (914 mm) from any condensing unit; and exempts existing dryer terminations. This section has been modified to read: M1502.3 Duct termination. Exhaust ducts shall terminate on the outside of the building. Exhaust duct terminations shall be in accordance with the dryer manufacturer's installation instructions. If the manufacturer's instructions do not specify a termination location, the exhaust duct shall terminate not less than 3 feet (914 mm) in any direction from the openings into buildings nor less than 12 inches from finished ground level or other obstacles. Exhaust duct terminations shall be equipped with a backdraft damper. Additionally, exhaust shall not terminate within 3 feet (914 mm) of condensing units and a minimum 12 inches (305 mm) from the ground or any obstruction. Screens shall not be installed at the duct termination. Existing dryer terminations shall be exempt.

(2) Section M1502.4.2 Duct installation. This section has been modified to prohibit ducts from being joined with any screws or similar fasteners that protrude into the inside of the duct and to change the length of support intervals from 12 feet to 4 feet. This section has been modified to read: M1502.4.2 Duct installation. Exhaust ducts shall be supported at 4 feet (1219 mm) intervals and secured in place. The insert end of the duct shall extend into the adjoining duct or fitting in the direction of airflow. Ducts shall not be joined with screws or similar fasteners that protruded into the inside of the duct. Where dryer exhaust ducts are enclosed in wall or ceiling cavities, such cavities shall allow the installation of the duct without deformation.

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