HVAC Site - Professional HVAC Contractors Forum banner
1 - 2 of 2 Posts

1 Posts
Discussion Starter · #1 ·
Hello, I am a Mechanical HVAC Engineer.
I have recently Joined a new Company.
My Manager posed a question to me which i cant find the answer.
I really need someone's help.


During Duct Fabrication stage, client gives us the specification under which we have to manufacture ducts from GI Sheet.
Specification such as thickness of the GI Sheet according to the Duct Size.
Usually Company prefers Sheet Metal and Air Conditioning Contractors (SMACNA) Specifications.
One example
(Duct Size) -- (Class B) -- (Class C)
(Longer Side) -- (Thickness) -- (Thickness)
(mm) (mm) (mm)
400 -- 1 -- 1
600 -- 1 -- 1
1500 -- 1.2 -- 1.2
Based on Duct size the Thickness Differs.
What is the Difference in Class B and Class C and various Classes under SMACNA

Please Help
1 - 2 of 2 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.