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My home has a 2-pipe steam system with mostly convector rads. I want to install vents at the top of my home's five steam risers, the purpose being faster air venting. For logistical reasons on a few risers, I'm not going to be able to install at the very top. But I could install vents a couple of feet below those riser tops. This is effectively lthe same thinig, isn't it?