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A few venting questions...
Happy winter steamers! As I am doing my annual boiler/radiator optimizing attempt this year, I decided to buy the Balancing Steam Systems Using a Venting Capacity Chart PDF and have come across a few questions that I'd love your thoughts on:
1) I am not understanding the difference between the three columns of venting capacity (1oz, 2oz, 3oz), could someone please explain the factors with why someone would use one over the other?
2) Under the "How much air is in the pipe?" section, is the Pipe Size column referring to the inner or outer diameter?
3) Finally, after doing the exercise with my system, I have found that the third column appears to 'line up' the best with my figures for (Total Air to Vent)/3, but I have a few radiators in the .4 range and am not finding a good option for vents in that column for .4. Does anyone have any suggestions on how to handle this?