Chapter 6 of the Oklahoma adopted IMC® 2018 has been adopted with the following modification: Section 604.1 General. This section has been modified to add a requirement to duct insulation to conform to SMACNA HVAC Duct Construction Standards - Metal and Flexible. This section has been modified to read: 604.1 General. Duct insulation shall conform to the requirements of Sections 604.2 through 604.13, the International Energy Conservation Code® and SMACNA HVAC Duct Construction Standards - Metal and Flexible.
Okla. Admin. Code § 748:20-14-11