venting kitchen island sink

drtechnoJuly 16, 2010

Hi all

I am venting a kitchen island sink. Is there a limit to how far you can run horizontal to connect to the main vent stack after you have run your loop vent under the island?

Thanks !!

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drtechno

I may have answered my own question.

It seems the max. horizontal run after the loop vent is 6 ft for a 2 in pipe. Does this sound about right?

    Bookmark   July 16, 2010 at 5:15PM
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manhattan42

"I may have answered my own question.
It seems the max. horizontal run after the loop vent is 6 ft for a 2 in pipe. Does this sound about right?"

No. It doesn't sound right. There should be no limit at all for the length of a horizontal run or 'foot vent' that gets connected to a main stack.

The only limit in most cases would be on the horizontal length of the trap arm between the sink trap and the island vent itself...which is limited to 8 feet for 2" pipe.

See the links below for how Code compliant Island vents should be installed under most codes:

http://www.plumbinghelp.ca/images2/Island%20loop%20vent.jpg

http://www.terrylove.com/images/island_vent.gif

If your kitchen island vent doesn't look like the above diagrams, you're not installing the island vent properly.

    Bookmark   July 16, 2010 at 9:39PM
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