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Air vent sizing

Steamhead (in transit)
Member Posts: 6,688
two Gorton #1 or Hoffman #75 vents on each main.
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Comments
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Steam main vent sizing
Currently have a 2" main x 40 ft with one Hofmann #77 and one Hofmann #75. Is this adequate? Other main is 2" x 36 ft with one Hofmann #75 and one Hofmann #35. Is this adequate? If not, please recommend proper Gorton sizes. Thanks0 -
Not Hofmann
These are Vent-Rite, not Hofmann vents. My error.0
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