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If I want to vent the mains as fast as possible, why are main vents usually teed off 3/4"? Why wouldn't I just keep the tee the same size as the main and then put enough vents to equal the same size as an open 2" pipe or whatever size the main is? It would take a lot of vents but if the mains have to be vented as fast as possible then this would be the way to do it. I don't see it done this way I'm assuming because of the cost. How fast should a main heat up? Is there a a specific number of minutes? I'm asking because I don't really know how to size vents I usually just guess. From what I've been reading is that you want to match the equivalent of an open pipe. So if most vent tappings are 3/4" then shouldn't I just be using 5 Gorton number 2s on every system?