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venting

I have been studying this board pretty well. I have a steam boiler (2 Pipe) system. I have 4 return pipes coming down into the main condensate line. 2 are are connected to a main loop and I have installed 2 vents on the ends of those, combo of hoffman 75's and Gorton no 1's. I have a couple Gorton NO 1's on there way so I can increase them to 3. It has helped a great deal. My question is the other 2 return lines are just condesate return lines (not connected to the main with 1 vent on the end of them. Would it be helpful to increase the no of vents on the return lines too?
Or is one vent at the end of those sufficient? Thanks for any help.
Ted
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