For pipes that have a diameter of 3 inches the distance is 6 feet and for a 4-inch pipe the most it should be away from the vent is 10 feet. Keep in mind that toilets have their own traps so there is no need to have one on the drain line, but it still must have a vent.
There are many different ways to vent your fixtures, and you're going to want to cater to the factors present in your bathroom. 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.
Yes, the toilet and sink can share the same vent, as can the shower. It's common to have one main vent pipe for multiple fixtures, although you might need a larger pipe. You should check with local building and plumbing codes to confirm you'll have adequate piping for your home.
In general, the vent should be as close as possible to the fixtures it serves. This proximity helps ensure the vent can effectively equalize air pressure and prevent sewer gas entry. However, there are some common guidelines to consider: The vent should be within 5 to 6 feet of the fixture drain it serves.
No more than four water closets or bathroom groups shall be installed within any branch interval of a 3" drain stack, and no more than a total of twelve on the stack.
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. You should check with local building code requirements to be on the safe side.
For pipes that have a diameter of 3 inches the distance is 6 feet and for a 4-inch pipe the most it should be away from the vent is 10 feet. Keep in mind that toilets have their own traps so there is no need to have one on the drain line, but it still must have a vent.
So those in UPC jurisdictions, simply make sure this distance is 6 feet or less (Footnote 2 of Table 1002.2). Additionally, if you plumb your toilet with a 4 inch toilet drain (which isn't usually necessary), the UPC still limits the trap to vent distance to 6 feet.
Vent pipes must be installed so they stay dry. This means that they should emerge from the top of the drainpipe, either straight vertically or at no less than a 45-degree angle from horizontal, so that water cannot back up into them.
The good news is that your plumbing vent can indeed be run horizontally.
continuous vent or equivalent indirectly connected to the toilet drain piping through a two inch (2") wet-vented drain that carries the waste of not more than one (1) fixture.
Surprisingly, some building codes do not require bathroom fans. All municipalities have different requirements, but some do not draw a hard line on requiring exhaust fans. Bathroom ventilation is needed in those areas, but it can be from a window or fan—you choose.
Behind or within the Wall: In most cases, the vent pipe for a toilet should run vertically from the toilet's waste pipe (known as the closet bend) and extend upward to connect with the main vent stack or a branch vent line that ultimately exits through the roof of your home.
Improper venting can hinder the flow of waste and water, causing you difficulties with flushing your toilet. You'll also notice slow drainage in your bathtub or toilet sink, as they typically share the vent stack with the toilet.
You need a 2" vent to take off from the branch line within 6 feet of the toilet. It can run up any convenient wall until it is above the toilet's flood level.
Your drains are connected – One of the main reasons your toilet gurgles when your washer machine drains is because your washer machine is connected to the toilet drain. This isn't uncommon. Your washing machine might have been placed in between your toilet and sewer stack.
Vent pipes that release sewer gases and maintain proper water pressure may incorporate bends or 90 degree elbows to navigate obstacles and connect to fixtures like sinks.
The installation of a recirculating exhaust fan is one of the easiest ways to vent a bathroom without an exterior exit. Recirculating fans filter the air via a set of charcoal or HEPA filters before releasing it back into the bathroom, in contrast to ordinary exhaust fans, which exhaust air outside.
As long as your 2” trap arm doesn't exceed 60” from the vent tie in you should be good, which from the look of it you are good.
Most modern plumbing codes require P-trap toilets for residential installations.
Typically in all bath fans I seen go in, a 30' run was allowed IF there was no elbows used. If elbows are used, which will be pretty much the case in any install, you need to deduct 5' for each elbow added.
A horizontal wet vent could have as few as two fixtures or as many as ten fixtures but not more than two fixtures of any type can be connected to the system.
In conclusion, while plumbing vents are traditionally designed as straight pipes, bends are permissible under certain conditions. Proper planning, adherence to local building codes, and maintaining the required slope are crucial factors when considering bends in plumbing vents.