Top Notch How To Vent An Island Sink

Obviously a vent pipe in a kitchen island cant do that.

How to vent an island sink. Enter the air admittance valve AAV. Install the vent between the sink p trap and the point where the waste line leading from the trap drops to the main sewer. A loop vent gets the needed air from the actual drain pipe just four or five feet away from your island sink.

Traps for island sinks and similar equipment shall be roughed in above the floor and shall be permitted to be vented by extending the vent as high as possible but not less than the drainboard height and then returning it downward and connecting it to the horizontal sink drain immediately downstream from the vertical fixture drain. The island fixture vent the air admittance valve and the combination waste and vent system. So it is a.

The drain line must have a cleanout upstream from the entry tee. One outlet on the tee extends downward into a vertical drain line and the other extends upward into a vent system that is open to the outside air. Measured horizontally in front of the cleanout opening.

Check your local code for pro. An island loop vent is allowed to turn below the top of the sink only because cleanouts are required to remove any blockage in the vent. However the sink is placed further away.

Run a vent pipe up out of the horizontal portion of the P trap as you would with a regular installation. The height of the loop vent is 38 from the floor. The vent valve lets air from under the sink to be drawn into the drain pipe to protect the trap.

Access for a drain snake takes the place of perfect plumbing design. The loop vent is constructed by two 90 degree 2 elbows PVC instead of a 45 degree - 90 degree - 45 degree combination. Install a normal trap under the sink and then run the drain down as usual.