New Technical Resource Bulletin (TRB)

From the Technical Resources Department. Update to the SMACNA HVAC Duct Construction Standards, Metal and Flexible, Fourth Edition, Figure 2-18 Corner Closures - Flanges.

This technical resources bulletin updates the language for corner fastening requirements used in conjunction with the T-25a and T-25b flanged transverse joint assembly.

TRB #01-25 Figure 2-18 Corner Closures - Flanges

Nov 24, 2025 — Member Update

Latest Articles

Council Meeting Update

Apr 1, 2026 - Time is running out to register and submit topics for this critical SMACNA event coming up in beautiful Quebec City!

Join Us for Customer Excellence Training!

Apr 1, 2026 - Upcoming in-person training program will aid service professionals show up on the job, in customer interactions, and within their teams.

Help Clear the Air Win a Shorty Award

Apr 1, 2026 - Episode featuring Rainier Metal Works named finalist in Technology and Education Podcast Category.

smacnalogo__185_287__with_white_3a5897_outline