That's a little better.
- The turn after the Tee connection should be changed to reduce resistance and provide better draft effect.
- Once you Tee units together into a run that run should be larger than the original individual runs because you are inputting more. Looks like it's the same 4"
- Even though the main is B-vent the insulation crammed around it isn't a good idea.
- From the looks of the sheetmetal I bet it's a newer induced draft furnace. Definite no-no having that hooked up on the run with the HWT's

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Accurate Inspections & Consulting, Inc.
847/736-9975
Markus Keller