Each vent pipe must extend through its flashing and terminate vertically. Vents that extend through the roof must extend undiminished in size, not less than 2 inches above the roof. Vent openings must be at least 3 feet away from any motor-driven air intake that opens into any habitable area.
Tips for Installing Vent Pipes
When installing a revent pipe, the horizontal portion must be at least 6 inches above the fixture's flood level or to the highest point water can rise. For example, the flood level for a sink is its rim or overflow hole.
The International Plumbing Code (IPC), requires plumbing vent pipes to extend vertically at least 152 mm (6 in.) above a roof, per Section 905.5, "Vent Connections and Grades." Additionally, vent pipes must be at least 305 mm (12 in.) away from a vertical surface.
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.
Since you've only got air (and, possibly some rainwater) running through the vent line, there should be no issue whatsoever with having two 90°s in the vent line instead of 45°s. So long as you can get it all to fit.
The drain-waste-vent pipe is run vertically and connected to your horizontal pipes. The pipes are run horizontally so that water can flow directly to the city sewer system so don't ever use a tight 90-degree elbow.
Can my toilet and sink share the same vent? Yes, the toilet and sink can share the same vent, as can the shower.
For a 1 ½-inc pipe the vent should be 42 inches away at the most while a 2-inch pipe must have a maximum distance of 5 feet. 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.
Section P3110 Circuit Venting
Not greater than eight fixtures connected to a horizontal branch drain shall be permitted to be circuit vented. Each fixture drain shall connect horizontally to the horizontal branch being circuit vented.
A universally accepted guideline for roof ventilation is the 1/150 ventilation rule. According to this rule, a roof must have ventilation that is at least one square foot for every 150 square feet of attic or crawl space. A minimum of 13.3 square feet of ventilation is needed for a 2,000-square-foot attic.
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 typical rule of thumb according to code requires you to run a horizontal pipe for no more than one-third of the total length. However, there are exceptions to this building code: If your minimum pipe size is increased by one pipe size, there are no maximum length limitations implied in the system.
Air Admittance Valves, sometimes called Durgo Valves, are one-way air valves that can be installed instead of Soil Vent Pipes, or sometimes in addition to them, to help keep the pressure in soil and waste systems balanced.
They extend through the roof to allow sewer gases to escape from your home safely. Without proper venting, these gases can build up inside your home, leading to foul odors, health hazards, and even dangerous levels of methane gas.
According to the UPC, the distance between your trap and the vent should be no more than 6 feet.
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.
Every fixture needs a trap, and every trap need a vent attached to the trap outlet before the trap arm drops more than one pipe diameter. So the kitchen sink trap vent will be above the floor, and the shower trap vent needs to be nearish the shower p trap, not at the location you drew.
Under the Uniform Plumbing Code, a 2" vent can handle 24 fixture units(F.U). In a residence, a lavatory sink= 1.0 F.U., bathtub/shower= 2.0 F.U. and a toilet 1.6 gallon or less= 3.0 F.U, greater than 1.6 gallon= 4.0 F.U. So, 3-lav sinks, 3-1.6 toilets and 3-tubs/showers could be on one 2" vent.
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.
Well, you can't! You'd often blow air from one bathroom into the other, and local building inspectors wouldn't approve it. But while you can't have two fans with one vent, you can make one fan and one vent serve two bathrooms. This setup requires an in-line exhaust fan.
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. Building code is a model code that each community can adopt and adapt according to its needs.
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes. 358.28 Reaming and Threading. (A) Reaming. All cut ends of EMT shall be reamed or otherwise finished to remove rough edges.
A short-90 degree is fine on a vent, but not allowed on a drain - as there's not much to get 'stuck' in a vent. Typically a 90 would be used on a vent as its fewer connections and less work, but no issue if you want to use two 45s.
As long as the jacket is not damaged it should be fine. Code states that Romex can be bent no less than 5 times the diameter of the cable.