Hi, I've been reading a lot on here, and have seen it clearly stated that vents cannot run horizontally until 6" above the flood level rim of the highest fixture.
But I'm confused by what I'm seeing in some books.
For example, these two illustrations. One side saying "never use dry flat horizontal vents", while the other side seems to show horizontal vents for a short distance before turning up vertical.
This illustration appears to show a short horizontal section of vent used to vent a toilet.
I wanted to ask if someone could explain what I'm missing in this. I am assuming that a vent pipe at 1/4" slope is still "horizontal", and that the vent isn't considered "vertical" unless it's 45 deg or less from actual vertical.
These aren't adding up in my head, and I was intending to vent a toilet drain in a new bathroom in a very similar way to the 2nd illustration above.
I am in MN, btw, and the local AHJ uses the MN plumbing code, which from what I can tell is similar to UPC. Although I have noticed differences, such as water closets must be vented 4' or less from trap (vs 6' in UPC).
Thanks in advance!
Keith
But I'm confused by what I'm seeing in some books.
For example, these two illustrations. One side saying "never use dry flat horizontal vents", while the other side seems to show horizontal vents for a short distance before turning up vertical.
This illustration appears to show a short horizontal section of vent used to vent a toilet.
I wanted to ask if someone could explain what I'm missing in this. I am assuming that a vent pipe at 1/4" slope is still "horizontal", and that the vent isn't considered "vertical" unless it's 45 deg or less from actual vertical.
These aren't adding up in my head, and I was intending to vent a toilet drain in a new bathroom in a very similar way to the 2nd illustration above.
I am in MN, btw, and the local AHJ uses the MN plumbing code, which from what I can tell is similar to UPC. Although I have noticed differences, such as water closets must be vented 4' or less from trap (vs 6' in UPC).
Thanks in advance!
Keith
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