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What Piping Configuration is this
I am hoping someone can help me with what this system layout is called (assuming it is called anything... maybe it is just a butchered mess). The steam leaves the boiler and once the piping reaches the ceiling, it is sloped down to each end of the basement, where it then pitches back towards the boiler as a return. Before dropping down to the boiler, there is an air vent, one on each (dry?) return.
What I would like understand, in addition to what this piping layout is called, is 1- Why is there no hartford loop, 2- I am about to replace the air vents on all the radiators. When I do that, based on everything I have read, it sounds like I should replace the main vents as well. What vent should I be installing on each of those return lines ?
Thank you !