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I need some help identifying a pipe in my boiler system. I have a 30 year old Weil MacClain boiler system (2 actually, as this is a duplex). I have a pipe that extends into the ceiling of my basement and presumably runs up to the upper unit somewhere. The other end of the pipe heads across the ceiling to an area near my basement floor drain where the pipe is open (uncapped). I cannot detect any liquid coming out of it (but it's summer). There is another pipe that T's down to another pipe that leads to the main boiler pipes in the lower unit. I might have assumed it was my condensate pipe but shouldn't there be two (one for each boiler)? If it is the condensate pipe, shouldn't it drain to the outside? I'd like to demo out or re-route this to remodel my laundry. Any idea what this is?
