What is wet venting in plumbing?

A wet vent system drains the water from one fixture while venting the air from one or more other fixtures. A dry vent system only transports air. No water is carried. In other words, wet vents may vent one fixture and drain another, whereas dry vents usually just vent air from one fixture at a time.

Is Wet venting OK?

Wet venting is a plumbing term and is a method of protecting the trap on a drain pipe on multiple plumbing fixtures. It is a useful method of venting and can save pipe and fittings, time and money.

How far can you run a wet vent?

The wet vent portion, from the vent connection at the sink to the wye that connects the toilet has no distance limit (it actually goes vertical). The portion from the vent connection to the sink is limited by the grade of the pipe (distance will vary as the pipe could be 2″, 1-1/2″, or 1-1/4″ for a bathroom sink).

What is the difference between a wet vent and a dry vent?

There are two basic ways to supply air to a drain line: through a dry vent or through a wet vent (if codes allow). A dry vent supplies only air to the drain line, whereas a wet vent functions as both a drain line and a vent.

Can a wet vent run horizontal?

There are different wet venting systems that both model and state plumbing codes allow. Vertical and horizontal wet vents are the most common of all these systems.

What is the minimum size of a wet vent?

2 inches
Sizing HWV Systems Therefore, the minimum size for the horizontal wet vent pipe is 2 inches and limited to four fixture units. A system having five or more fixture units must be increased to 3 inches.

How close to the toilet does the vent need to be?

6 feet
According to the UPC, the distance between your trap and the vent should be no more than 6 feet. In other words, for the vent to work properly, it needs to feed into the drain line within 6 feet of the trapways that connect to it.

Can a kitchen sink be wet vented?

The kitchen drain cannot be used as a wet vent.

How far can vent be from shower drain?

The maximum distance from a shower trap arm to a vent is usually 5 feet, though some municipalities may allow up to 8 feet.

Does a plumbing vent have to go straight up?

Plumbing vents need to be straight on the vertical. This is necessary to avoid any vapor locks from occurring. When there is a bend in the vent pipe, moisture accumulates and is trapped.

Does a toilet need a vent stack?

“Does a toilet need a vent?” And the answer is yes, your toilet has to have a vent. For more information on the great importance of plumbing vents, read our plumbing vent article here. And the size of this vent pipe depends on your local plumbing code.

Can you vent a toilet with 2 pipe?

It’s typically recommended that you go with a 2″ PVC pipe for the vent. This is according to the uniform plumbing code (UPC). It may not be enough, depending on how many fixtures you are trying to run off the vent.