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Last radiator on system heating slow
The house I bought this year has a 1 pipe steam system. I replaced all the radiator vents and they all seem to heat up evenly except the one in my bathroom. It usually wont get too hot or it wont heat at all if its not running long. The one in my bathroom is the last one on the run. I noticed there is one main vent on the system which is just before the piping turns up to goto the bathroom radiator. It seems like it's venting a little bit. If I put my hand a little above the vent when the system is running I can feel a very little bit if air blowing out of it. I'm wondering is it's plugged or the wrong size. It's a Vent Rite #35. I have an adjustable vent rite on the radiator in there set to the highest vent setting (8). The house has 2 radiators up stairs and 6 downstairs including the bathroom.
Any ideas? I think it's a bad main vent and I can't find any other ones.