Tying New Duct To Existing

What's the existing size/class and how does the spec want the tie-in?

I'm checking tying new duct to existing at [location]. I found Mismatch in size or class; leaks or restriction at the joint. What's the existing size/class and how does the spec want the tie-in?

Rectangular Duct & Fittings 3rd Year YELLOW

Stop if

Hold point on tying new duct to existing: I have the location, photo, drawing/detail/spec section, and what I checked. Who should verify before this gets cut, drilled, covered, supported, labeled, connected, or signed off?

Watch out

Cut into existing before confirming it's isolated

Check

room/grid/area
photo of condition
drawing/detail/spec/submittal
what I already checked
what is blocking progress

Say this to your foreman

14540 tying new duct to existing rectangular duct yellow 3 what's the existing size/class and how does the spec want the tie-in? i'm checking tying new duct to existing at [location]. i found mismatch in size or class; leaks or restriction at the joint. what's the existing size/class and how does the spec want the tie-in? tie into existing duct tie-in, mating existing, transition to existing