Flex Length And Sag Limits
Too-long/saggy flex kills airflow; excess used
Yellow / Check First1stBatch 5
What This Helps With
Too-long/saggy flex kills airflow; excess used
Apprentice words: flex length limit
Trade terms: flex duct, max length, sag limit, support spacing
Check First
Allowed length/sag and support spacing per spec/energy code
What Not To Do
Use flex as free-form ductwork
What can go wrong: Running long saggy flex to save trunk work
Better Foreman Question
What's the flex length/sag limit on this job?
Verify With
Reference type: project spec
Source to verify: Spec; energy code; flex maker; SMACNA flex guidance
Safe wording: Limits per spec/energy code and maker; TinnerFlow gives general good practice.