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The short main coming from the boiler is a 2.5" and 23' long. The problem is that it is inside a crawlspace that I don't have access to.
The return line from that main protrudes from the wall and I was thinking of putting an air vent on it, as from what I can see there is no air vent. The only problem is that the return is 2 ft below the main line and 5 ft away from it as you can see in the diagram.
1) What air vents should this main have?
2) Can the air vent be put on the return?
3)Should the air vent be on position A or B?
And what size pipe should be used to connect the main vent to the return, 1/4", 1/8"?
Burnham Independence IN8