Reading Duct Gauge Off The Spec
Wrong gauge for the size/pressure class; too light oil-cans and leaks
Yellow / Check First2ndBatch 4
What This Helps With
Wrong gauge for the size/pressure class; too light oil-cans and leaks
Apprentice words: duct thickness
Trade terms: gauge, sheet metal thickness, pressure class
Check First
Duct size, pressure class, and the gauge schedule on the mechanical spec
What Not To Do
Guess gauge by feel or reuse leftover stock without checking the size
What can go wrong: Installing lighter gauge than the pressure class requires
Better Foreman Question
What pressure class and gauge does this run call for on the schedule?
Verify With
Reference type: SMACNA
Source to verify: SMACNA HVAC Duct Construction Standards; project mechanical spec
Safe wording: Point to the SMACNA gauge/pressure-class schedule and the job spec; TinnerFlow explains the concept, the spec sets the number.