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The Daily Fix

The Daily Fix

Vent a Kitchen Island Sink with an Air-Admittance Valve

comments (2) July 4th, 2010 in Blogs
rwotzak rwotzak, Web Producer

Air-admittance valves work simply and offer venting flexibility.
Large AAV
Medium AAV
Air-admittance valves work simply and offer venting flexibility.Click To Enlarge

Air-admittance valves work simply and offer venting flexibility.

by Lynn Underwood

Suction opens the valve, and gravity closes it

Sewer gases trying to escape seal the diaphragm to the rim of the air-inlet basket, which keeps the gases inside the pipe. When a sink is drained or a toilet flushed, this slight positive pressure is relieved because air is sucked in through the basket. This rushing air pushes up the diaphragm, connecting the basket to the drainpipe. After the flush, gravity drops the diaphragm back into place.

Click to enlarge image
Ait-admittance valve

You can vent more than just one sink

Large AAVs Medium AAVs Small AAVs
Pleated pouch bag Make a sack Box the bottom corners
160+ DFU; $35. Cap a main vertical vent stack in the attic and vent most fixtures in a house.   20 DFU; $30. Can cap a vent stack in the attic or vent a high-volume horizontal branch line.   6 DFU; $25. Can vent a single horizontal branch line, such as a bathroom.

Read the complete article...
Vent an Island Sink...and Other Tricky Spots
A handy one-way valve eliminates most of the plumbing work
by Lynn Underwood
Get the PDF


posted in: Blogs, kitchen, plumbing, built-ins

Comments (2)

Moshup_Trail Moshup_Trail writes: I agree. What a pain the backside.
It just increases my resolve NOT to pay twice.
There are so many other similar sites.
Posted: 9:50 pm on July 8th

Dreamcatcher Dreamcatcher writes: Nice, making this a members only article. What's the point in that.

I have never understood why I should have to pay [more] to be an online member when I have been a magazine subscriber for years. What a lame money grab. You know you guys already make plenty of money off magazine subscriptions and advertising. Hanley Wood Publications doesn't even charge me a magazine subscription. Plenty of other -free- sources of construction information on the internet. Sorry to see you aren't one of them.

Posted: 7:34 am on July 6th

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