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Working on some projects at home and as usual my mind started wandering.
Why was 4" the standard pipe size for the drain in houses for years? And when and why did it end up dropping to 3"?
Obviously 3" is more than big enough for most houses, but if that's the case why was 4 "the norm" for so many years? 4" doesn't fit in a standard wall and costs quite a bit more money so I have to think there was a reason originally. Is this a cast iron vs PVC thing? 3" wasn't a standard size at one point?
I'm sure someone out there knows the history.
Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment