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Hi. I have a one-pipe steam system with two mains off the boiler. In 2017, we put a Gorton #2 on the main that feeds a few rooms, including the family room. In late 2019, we put a Barnes and Jones Big Mouth Air Vent on the other main (which had no vent and had been capped off). The system was actually running great for a while. The family room was one of the warmest rooms in the house. However, recently, the family room and the small powder room (both on the same main), are now the coldest rooms and not heating fast at all. I even switched to a D air vent on the family room radiator, and it still seems to be taking a while to heat up. I believe my system is shutting off before it can completely heat since the room with the thermostat is on the other main. So, the room with the thermostat will reach the set temperature of 69, but the family room will still only be at 64. As I stated early, everything was great and the family room was one of the warmest rooms until the last few weeks. Is it possible the Gorton #2 vent has gone bad? Any other thoughts would be appreciated!!