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Hello,  I have a single pipe steam system with 11/2" main's and 1 1/4" risers. It is broken into two zones above the boiler.

 Zone 1 is 80' long with risers going to 3 1st. floor radiators and 2 second floor radiators.

Zone 2 is 60' long with risers going to 1 second floor radiator and 4 1st. floor radiators, 2 have long risers into crawl spaces.

I want to get the main vents working corectly.

I need to know how many (Gorton #2 or other) vents to install on each 3/4" X 6"  riser at the end of each zone.

Thank you very much, Jim

P.S. I ordered a bunch of Dan's books but it will take me a long time to find the answers to this.


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