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Main steam vent sizing question

Eric_8Eric_8 Posts: 66Member
Would appreciate your input on which main vents I should use (Gorton #2s? how many?) based on the following:

1st main is about 170 feet with 3 elbows, and
2nd main is about 125 feet with 2 elbows

The mains are 4.5 inches in diameter.

Currently, we have one Hoffman 75 at the end of each main, and I suspect that is quite insufficient. Thanks!

DL

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