In California, which is based on UPC, a 1-1/2″ vent, properly installed, can vent a 3″ toilet drain. However, local codes can vary, so it’s always a good idea to draw a diagram and get a permit, so they can inform you of any special rules or anything you may have missed.

Can you use inch and a half pipe for vent on a toilet?

PlumbersStock explains that all toilets need venting and suggests using a 2-inch PVC pipe that conforms to the Uniform Plumbing Code. If you are unsure, it is best to check with the local building code requirements. The distance from the trap and vent should not be more than 6 feet to work correctly.

How big does vent pipe need to be for toilet?


Toilet Vent Pipe Size? 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.

Can you drain a toilet into a vent pipe?

Choose a Toilet Vent or Drain Configuration

If the toilet drain does not connect directly to a vent, you must find another way to vent it. If the drain line runs away from the wall where you want the vent, use a reducing Y and a 45-degree street elbow to point the vent line toward the wall.

Is Wet venting allowed in California?

One or two vented lavatory(s) shall be permitted to serve as a wet vent for a bathroom group. Only one wet-vented fixture drain or trap arm shall discharge upstream of the dry-vented fixture drain connection. Dry vent connections to the horizontal wet vent shall be in accordance with Section 905.2 and Section 905.3.

Can a toilet vent be 2-inch?

Your toilet’s individual vent needs to be 2”. (See UPC Section 904.1, Table 703.2, and Footnote 3 of Table 703.2). And if that’s you, install a 3”x3”x2” wye, with a 2” street 45 to vent this toilet. I’ll also quickly mention…in UPC jurisdictions it’s common to see one toilet in the home plumbed with a 3 inch vent.

Can a toilet vent be downstream?

Can a toilet vent be downstream? Never. A toilet vent always should be upstream. The purpose of the pipe is to allow sewer gases and water from entering your house.

Is 3 inch pipe OK for toilet?

Waste drain pipes for toilets in modern plumbing systems are either 3 inches or 4 inches in diameter. The wider the pipe, the more waste it can move and the less likely it will be to clog.

How do you properly vent a toilet?

The most common configuration is to feed 2″ PVC down from the ceiling within the wall behind the toilet. The vent pipe connects into the toilet drain pipe. The sink drain pipe and the tub/shower drain pipe are vented with 1.5″ pipe that branches off from the 2″ PVC mainline.

Can you vent a toilet with a studor vent?

The Studor vent lets that air to be sucked in the pipe during water flow but doesn’t let sewer gas escape out. Code is the thing that determines pipe size and also water flow. Hence no studor vents are permitted to toilets because more air is required to keep water flow going with more waste added to the toilet.

Can two drains share a vent?

Common vent

This very simple concept allows two traps to be vented by the same vent. The two traps and their fixture drains can be either at the same level or at different levels, provided that they are on the same floor. The following diagrams show some of the various approaches to common venting.

What is a plumbing cheater vent?

ABS In-Line Cheater Air Admittance Vent Trap (2-Pack) Help prevent sewer gas from entering your. Help prevent sewer gas from entering your home while you vent your drain line with the Oatey 1-1/2 in. ABS In-Line Air Admittance Vent. This spring-loaded vent uses negative pressure to open and positive pressure to close.

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

Install the vent between the sink P-trap and the point where the waste line leading from the trap drops to the main sewer. If the waste line has a diameter of 1 1/4 inches, the vent can be no farther than 2 1/2 feet from the trap. If the waste line is 1 1/2 inches, this critical distance is 3 1/2 feet.

Can a toilet vent run horizontal?

To answer your specific question, yes, vent pipes can have horizontal runs, as long as there is no possibility of them becoming plugged with water. In other words, any water that gets into the vent pipe opening must be able to run freely all the way to the sewer, without creating a “trap”.

Does a vent pipe have to be straight?

Do Plumbing Vent Pipes Need to be Straight? 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.

What happens if you don’t vent a toilet?

Poorly-vented drain lines will not be able to effectively move wastewater and solid waste out of your building. This could lead to problems such as overflowing drains, backed-up toilets, and similar plumbing issues.

How do you vent a toilet without a vent?

What is a ventless toilet and how does it work? Ventless toilets are just like regular ones, except there is no vent for the toilet to release the water vapor. Instead, they use a siphon action that pulls the water out of the toilet bowl into an underground waste pipe.

Can I install a toilet without a vent?

Yes, every toilet needs a vent pipe to work well. Without it, your toilet could not get rid of waste and debris. The toilet needs venting to balance the atmospheric pressure, enable the flush system, and prevent awkward smells.

How do you vent a toilet without outdoor access?

How to Vent Your Bathroom with no Outside Access

  1. Vent beneath the floor. If your bathroom is situated away from your exterior wall, venting through the roof is impossible. …
  2. Add a ceiling vent. …
  3. Expand your bathroom ducts. …
  4. Add a recirculating fan for your half bath. …
  5. Install commercial ductwork. …
  6. Add a fan.

Is it OK to vent bathroom fan into soffit?

Venting bathroom through soffit means you don’t have to put a hole in the roof. That’s because it may cause it to leak, especially if you have an old roof or the ventilation is done poorly. Venting the bathroom fan to the soffit help keep it leakage-free.

Can a dryer vent be used for a bathroom vent?

You can’t use a dryer vent duct for the bathroom fan. This is against building codes because it’s unsanitary, poses a fire safety risk, and will not function properly. It’s best to have an independent duct for the bathroom fan.