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Air Vents Through the Roof?!
I am in a multi-family building, (27 units, 3 stories) which has a single pipe system. We regularly maintain it and have purchased a decent set of controls to maintain the system operating consistently. I am working on having the supply piping insulated.
The building was gut-rehabbed in 1998, and after walking on the roof the other day, I noticed there are air vents on the roof - located roughly at the top of each steam riser. I find this quite strange and haven't yet read anything that leads me to believe this is regular. In addition, we do have a 'bell' like air vent inside the building. These are located only on the third/top floor and above the radiator at the ceiling AND only in the kitchens (no where else). These 'bells' are located at the top of the riser (above the radiator by 6ft) and just before it extends through the ceiling and onto the roof.
I can only image this is like a belt-belt-belt and suspenders type of set up - with some amazing venting - however there are limited complaints about water hammering. Anyone experienced this type of set up or would suggest these air vents on the roof are unnecessary and could be removed at all locations? It seems like we are losing a lot of heat to the exterior! Thanks for your comments.