Undersizing a branch takeoff because airflow CFM was not calculated
1st YearDuct Systems
Get the CFM for every outlet from the mechanical schedule before sizing any takeoff. Use a duct calculator or friction chart to confirm the collar size de…
Safer field move
Get the CFM for every outlet from the mechanical schedule before sizing any takeoff. Use a duct calculator or friction chart to confirm the collar size delivers the required airflow.
Ask Foreman
Can you verify this before I keep going? I’m looking at: Undersizing a branch takeoff because airflow CFM was not calculated. What’s the approved correction for this job?
Do not
Do not hide, force, cover, or “make it work” if this affects safety, access, airflow, rated assemblies, supports, equipment, or inspection. Stop and verify the approved correction.