Thanks for this. Finally another question I've pondered from time and again is answered.
Living in NYC all my life, I knew about the system, and who used it. I was always curious about why the system would be vented (other than a leak). Of course, by the time I'd get home, I'd forget to look it up.
Living in NYC all my life, I knew about the system, and who used it. I was always curious about why the system would be vented (other than a leak). Of course, by the time I'd get home, I'd forget to look it up.