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How do I calculate main vent sizing?
Hi-- I would like to make sure my main vents are properly sized. I have 2 main vents, located at the end of the 2 dry returns before they drop to the floor. They are both Vent-Rite #75, which my plumber recently installed. I am not sure they the right size however, and would like to confirm.
I have attached a diagram of my basement piping.
Here are the sizes and lengths of all the basement pipes for the main/return #1 and #2:
(#1) 1.25" pipes: 22.3 ft
(#2) 1.25" pipes: 21.3 ft
(#1) 2.5" pipes: 22.3 ft
2" pipes: 10.4 ft
(#2) 2.5" pipes: 21.3 ft
1.25" pipes: 14.6 ft
When making my main vent calculations, do I measure both the length of the steam supply mains, AND the dry returns? I'd like to go with the Gortons. Would Gorton #2s for both main vents work? Any help would be very much appreciated.