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# Angle for toilet vent

## Angle for toilet vent

#1
04-05-06, 10:24 AM
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Angle for toilet vent

I know that vents have to attach to the waste line at a 45 degree angle. Can a toilet vent run at (almost) horizontal, under the floor, after leaving the waste line until it gets to a wall cavity, where it turns straight up?

-Antun

#2
04-05-06, 11:25 AM
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Join Date: Jan 2004
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This diagram shows what I mean:

http://www.antunkarlovac.com/stuff/b.../horiz_run.jpg

-Antun

#3
04-05-06, 01:09 PM
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Yes it can - sometimes there isn't any choice. I would use either a long-turn 90° or 45°/st 45° where it turns up. Drain fittings below the flood level is code in my neck of the woods.

#4
04-05-06, 01:46 PM
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-Antun

#5
04-05-06, 10:57 PM
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> What does the flood level mean?

-- the maximum vertical height above the earth's surface that water can backup until it runs onto the floor.

In the case of a sink or toilet, that's the rim of the bowl.
If the water gets any higher, it "floods" your bathroom.

#6
04-05-06, 11:08 PM
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> I know that vents have to attach to the [horizontal] waste line at a 45 degree angle.

Whose rule is this?

> Can a toilet vent run at (almost) horizontal, under the floor,
> after leaving the waste line until it gets to a wall cavity,
> where it turns straight up?

Here's what I'd do if there is room:
At the bottom of the vertical vent, use a 60° elbow.

Run pipe over to the drain line.

Put on another 60° elbow aimed straight down.

Add a short piece of pipe to connect vertically to the soil pipe.

#7
04-11-06, 11:07 PM
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45° or better.

#8
04-12-06, 12:38 AM
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Originally Posted by steve_gro
45° or better.
Correct. 90° >= 45°. A take-off 90° is fine.

Perhaps antun saw that same diagram. The key is >45°. It doesn't have to be exactly 45°.

Thanks for the diagram. It needs work so as not to confuse people. It should say "more than 45°" or "45° or more".