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Hello all, a few questions from a heating novice. My brother just bought a new home and I was over there last weekend helping him move some stuff in. It's a two story home with baseboard heat. While I was over there we had the heat on and the heat on the first floor was working great but the heat upstairs didn't seem to be working well at all. So we decided to purge that zone to see if air in the system was the problem, that must have been it because after we purged it out it started working great. It's a zone valve system with three zones, basement, first floor, second floor. My question is there's a Spirovent and I'm wondering if they ever go bad or need to be cleaned? Also, the pressure gauge says the system is running at 12psi right now, does that seem right? Should the auto fill valve, expansion tank, and boiler pressure(?) all be set to the same psi? We're not going to cut into the system and replace an air separator but I figured if they're easy to clean maybe we could tackle that. Thanks in advance for any input.