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Main vent sizing neede

I have a 2 family with each their own steam boiler.

All 2" piping for the mains

Boiler #1
main #1 length is 36' & 7"
main #2 length is 61' & 4"

Boiler #2
main #1 length is 56' & 0"
main #2 length is 76' & 9"

What size main vents are needed for each boiler's mains?

Thanks in advance for the info.



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