Should toilet vent be upstream or downstream?

A toilet vent always should be upstream. The purpose of the pipe is to allow sewer gases and water from entering your house.

Does a toilet vent need to be downstream?





A toilet vent can be upstream. The purpose of the vent pipe is to allow the sewer’s gases to escape from the house’s roof rather than inside the house. A vent also allows oxygen to enter into the sewer pipes, which allows the waste to break down and prevents clogging.

Does the vent go before or after the toilet?

​Connect the Vent Underneath the Toilet:​ If the toilet waste pipe drops vertically to a long-sweep elbow, you can install the vent in the vertical pipe before the fitting. You would do this with a reducing wye with its sweep pointing downward and use elbows to change the direction of the vent pipe as needed.

Can a plumbing vent be downstream?

Vertical wet vented systems are required to have the water closets as the most downstream fixture. This is not the case in horizontal wet venting. The dry vent must be sized in accordance with Section 906.2. Remember, though, that in this case, the drain served is going to be the entire wet vented section.

How far downstream can a toilet vent 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 the vent be behind the toilet?

Quote from the video:
Quote from Youtube video: Needs a vent toilets have traps built right in the bowl. So you'll definitely need to vent your toilet.

Can plumbing vent pipes run horizontal?

There is no problem with running your vent pipes horizontally as long as you remember that there should be a minimum clearance of 6 inches above the spill line. What is a spill line? This is the level where the water starts to overflow from the rim of the sink, toilet, or tub.

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.

Does a vent pipe 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.

Can two toilets share a vent?

The waste lines can usually be tied into the same stack if the house has more than one toilet. They may need their own stack if they are on opposite sides. Two vent openings on the roof are needed since the stacks must be vented.

Can a toilet and a shower share a vent?

So yes the shower can also be vented by the wet vent along with the toilet. There is one major stipulation when wet venting multiple fixtures when a toilet is one of them: the toilet must be the last fixture connected to the wet vent.

What is upstream and downstream in plumbing?



Downstream is the flow of fluid towards the end point of a pipe you are considering while upstream is away from the the end point i.e. going upward.

What is downstream air?

By definition, downstream would mean after the blower, upstream would be before, opposite the direction of air flow in relation to the blower.

What is downstream pipe?

Downstream Pipeline means the existing pipeline immediately downstream of the Delivery Point(s) established hereunder. Downstream Pipeline means all Gas pipelines with a connection at the delivery point which transport Gas from Buyer’s Facility.

Does water flow upstream or downstream?

The term upriver (or upstream) refers to the direction towards the source of the river, i.e. against the direction of flow. Likewise, the term downriver (or downstream) describes the direction towards the mouth of the river, in which the current flows.

Is water quality better upstream or downstream?



The only significant differences were in the nitrite (0.3 ppm and 0.0 ppm) and total hardness (50 ppm and 120 ppm) levels for upstream and downstream, respectively. Comparing these to the CDPHE-WQCD regulations, the water from downstream seems to be slightly better in quality.

Is upstream against the current?

The definition of upstream is against the current, or toward the beginning. An example of upstream used as an adjective is the phrase “an upstream swim,” which means a swim against the current.

Does a river go upstream?

Rivers tend to flow downstream, but sometimes they don’t. Sometimes they flow sideways and sometimes they flow upstream!

Where is the upstream and downstream in a river?

To help you remember which way is upstream on a river, if water comes from, for example, the mountains and flows in a river to the sea, water near the mountains (or source) is upstream, and water nearer the sea is downstream.

Which way is upstream on a river?



If you are entering a channel or waterway from the sea, you are traveling upstream. Water will often flow from north to south. This means that if you’re traveling north, you will likely be boating upstream.