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Boiler vents - I must be missing something
Recently, I've driven and biked past two large, multi-story condominium developments under construction. They both have what appear to be gas boiler vents for every unit. Each vent assembly has two pipes, which I assume are intake and exhaust. The pipes are right next to each other, as in maybe 8" to 10" of separation. In addition, they are both at the same height and angle. Here's my question: isn't this a recipe for re-circulation? Or is what I'm seeing dual-intake or dual exhaust?