Okla. Admin. Code § 748:20-14-13

Current through Vol. 42, No. 8, January 2, 2025

Section 748:20-14-13 - IMC[®] 2018 Chapter 8 Chimneys and Vents

Chapter 8 of the Oklahoma adopted IMC® has been adopted with the following modifications:

(1) Section 805.3 Factory-built fireplaces. The originally published Section 805.3 entitled "Factory-built chimney offsets" has been moved to Section 805.4 and a new section 805.3 entitled "Factory-built fireplaces" has been added to address errata published by the ICC®. The modification adds a requirement for chimneys used with factory-built fireplaces to comply with UL 127. This section has been added to read: 805.3 Factory-built fireplaces. Chimneys for use with factory-built fireplaces shall comply with the requirements of UL 127.

(2) Section 805.4 Factory-built chimney offsets. The originally published Section 805.4 entitled "Support" has been moved to Section 805.5 and the previously published Section 805.3 entitled "Factory-built chimney offsets" has been moved to Section 805.4. No other modifications have been made to the section. This section has been modified to read: 805.4 Factory-built chimney offsets. Where a factory-built chimney assembly incorporates offsets, no part of the chimney shall be at an angle of more than 30 degrees (.52 rad) form vertical at any point in the assembly and the chimney assembly shall not include more than four elbows.

(3) Section 805.5 Support. The originally published Section 805.5 entitled "Medium-heat appliances" has been moved to Section 805.6 and the previously published Section 805.4 entitled "Support" has been moved to Section 805.5. No other modifications have been made. This section has been modified to read: 805.5 Support. Where factory-built chimneys are supported by structural members, such as joists and rafters, such members shall be designed to support the additional load.

(4) Section 805.6 Medium-heat appliances. The originally published Section 805.6 entitled "Decorative shrouds" has been moved to Section 805.7 and the previously published Section 805.5 entitled "Medium-heat appliances" has been moved to Section 805.6. No other modifications have been made. This section has been modified to read: 805.6 Medium-heat appliances. Factory-built chimneys for medium-heat appliances producing flue gases having a temperature above 1,000 degrees Fahrenheit (538 degrees Celsius) measured at the entrance to the chimney shall comply with UL 959.

(5) Section 805.7 Decorative shrouds. The originally published Section 805.7 entitled "Insulation shield" has been moved to Section 805.8 and the previously published section "805.6 entitled "Decorative shrouds" has been moved to Section 805.7. No other modifications have been made. This section has been modified to read: 805.7 Decorative shrouds. Decorative shrouds shall not be installed at the termination of factory-built chimneys except where such shrouds are listed and labeled for use with the specific factory- built chimney system and are installed in accordance with Section 304.1.

(6) Section 805.8 Insulation shield. The originally published Section 805.7 entitled "Insulation shield" has been moved to Section 805.8. No other modifications have been made. This section has been modified to read: 805.8 Insulation shield. Where factory-built chimneys pass through insulated assemblies, an insulation shield constructed of steel having a thickness of not less than 0.0187 inch (0.4712 millimeter) (No.26 gage) shall be installed to provide clearance between the chimney and the insulation material. The clearance shall be not less than the clearance to combustibles specified by the chimney manufacturer's installation instructions. Where chimneys pass through attic space, the shield shall terminate not less than 2 inches (51 millimeter) above the insulation materials and shall be secured in place to prevent displacement. Insulation shields provided as part of a listed chimney system shall be installed in accordance with the manufacturer's instructions.

Okla. Admin. Code § 748:20-14-13

Adopted by Oklahoma Register, Volume 38, Issue 24, September 1, 2021, eff. 9/14/2021