We participate in Amazon Services LLC Associates, our advertising program designed to provide us with a way to earn fees by linking to Amazon.com and its affiliate sites. If you are ready to take on the task of remodeling your kitchen or bathroom, you might feel intimidated when you think of plumbing. There is a lot you need to know before embarking on any major changes. Fortunately, the basics are easy to learn. Our plumbing hatch diagram and simple DIY instructions will get you ready to take over your remodel before you know it. Let’s take a look at how to properly vent pipes. Then you can start remodeling your kitchen or bathroom with confidence. Here’s what you need to know to complete your project. How to properly vent pipes So, you’re ready to remodel your kitchen or bathroom and realize new plumbing is right. If this isn’t a problem you ran into before, you might find it a little more difficult than most other DIY projects. Before you panic and call a plumber, know that there are simple ways to ensure your pipes are properly ventilated. A quick internet search for “plumbing hole diagram” will bring up multiple methods of addressing this issue. But how do you know which one will work in your home? What are the pros and cons of each system? Whether it’s a new sink, basin, or toilet, here’s how to properly vent pipes. Understanding a Plumbing Vent Visualizing the pipes inside your wall (using a plumbing vent diagram) gets easier if you start from where you can see it. You’ve opened the tanks under the sink before to see the P-tube just below the drain, right? It’s called P-trap, and it initiates the drainage / ventilation process. Read related: Everything you need to know about plumbing traps These drain pipes connect to showers, sinks, sinks, and other devices in order to carry water away after it’s done use. From there, the water travels to slightly larger drain pipes as they continue to connect and work their way into the stack. Soil tubes do the same for toilets. The stack pipe leads out completely through your roof and then underground in the opposite direction to the main sewer lines. Water and waste are directed down the tube, while gases are vented up and out. The stack also allows fresh air to enter to keep water flowing smoothly through your pipes. Without the stack to properly ventilate things, your home will be filled with harmful sewage gases. To help the stack do its job, ventilation pipes are often added to the fixtures. This allows the gases to move freely away from your home while you are using the fresh air to move the sewage freely. It’s not something most homeowners like to think about. But it is an important part of any home. When you renovate or repair your plumbing or just add new fixtures, it is imperative that you ensure that this system is working properly. Types of ventilation There are four main types of ventilation used in piping. They are: the real hatch, the re-ventilation tube, the common hatch and the ring vent, the real hatch is aligned vertically and attached to your drain line across the roof. This is best performed if one of the fixtures is located near the stack and the top floor of your home, allowing the stack to act as a ventilation hole. Also, the real holes have no water running through them. While the true hatch is simple, it is not always a feasible solution since fixtures are rarely located near the stack. Re-ventilation pipes, known as auxiliary vents, are attached to the drain line near your fittings. They run up and over the main hatch. They can attach behind your fixtures or horizontally with the drain line. These are excellent options when the sink is too far from the main stack. If another fixture is on the other side of the wall, you may want to use a combined ventilation hole. This allows both drain lines to be bonded together in a sanitary cross. You can usually find them in cascades. Ring Louver is a solution to many of the freestanding sinks codes. It wraps up and around before connecting to the drain pipe. This allows for ample ventilation right behind your fixtures. There is also a wet ventilation hatch. However, they are mostly reserved for ponds that are located near a stack and your area code may not allow them. As an alternative to venting completely, some codes allow air intake valves. These allow air to enter as waste drains, and then rely on gravity to close them back up before any gases can return to the room. These are relatively new, so be sure to check your area codes before purchasing any of them. Placing your fixtures Regardless of which ventilation system you choose to use, it is also important to place your fixtures a certain distance from the ventilation duct. This area is called the critical distance and it includes some math to find out. The size of your pipes, the type of fixtures you install, and the number of fixtures that vent into your home all play a role in determining this measurement. During this stage, it is highly recommended that you consult a plumbing inspector after measuring the length of your pipes. They can also tell you how to properly ventilate your pipes, indicating which of the systems would work best while meeting your local code. Ventilation Hole Installation Unlike drain pipes, ventilation pipes do not need to be sloped. You can play it on a level as long as there are no obstacles to overcome. The main goal here is to ensure that the ventilation pipes remain dry. This is why most diagrams visualize it running vertically, making sure that the water cannot return to the system. Re-ventilation is the only exception as it works horizontally. However, it should be at least 6 inches above your fixture overflowing to prevent getting wet. On the sink, this will be either the flange hole or the overflow. Related reading: Plumbing Tools A homeowner will use a note about master drainage when installing your vents, it is highly recommended to plan drain lines to reduce the risk of clogging. Both the kitchen (1-1 / 2 inch) and the bathroom (1-1 / 4 inch) are smaller than the rest of the drain system on purpose. It leads to larger drainpipes, which leads to a 4-inch pile. Since the main stack is vertical, this tube is rarely clogged. While the other tubes connecting the stack must be horizontal, making it larger allows an ample amount of water to flow through it freely. This is also a good time to have a professional check the main drain line, which is located underground, for any blockages. Helpful Plumbing Ventilation Diagrams To help you better visualize what these piping systems look like, we thought it might help incorporating a plumbing hole diagram. The photo below shows a typical bathroom with multiple plumbing holes. There’s even a wet air vent attached to the bathtub. As you can see, the real hatch corresponds to the stack directly behind the toilet. However, the sink is placed further away. Therefore, a re-vent was added to ensure the leakage of sewage gases. This next photo shows the different types of ventilation tubes behind the tub. It gives you a more accurate idea of what it might look like on your own project. Depending on the design of your home, one of the two will likely be better for you. This image clearly shows what the loop ventilation hole looks like, which you may need to use if your aquarium is too far from the stack of the re-ventilation tube. It also shows what a sanitary cross would look like if you had a sink across from a wall. Both basins connect at one point, and share a common true ventilation hole to the stack. From the side corner, it becomes easy to imagine what these pipes might look like behind your bathroom or kitchen walls. Note how the main ventilation hatch and the waste pipe remain separate behind the tub, connected only via the attached separate tube. This return is at least six inches above the overflow line and is properly connected to the drain T. Additional information on the air intake valve If your walls do not leave enough room for any of the above-mentioned openings, the local code may allow you to choose an air intake valve (AAV). This one-way valve is designed to allow air to enter the plumbing when negative pressure from the drain occurs. After letting the air in, it shuts itself off to prevent odors and gases. These devices are usually attached to the bottom of the sump just after the trap, ensuring adequate air access to your piping. Keep this method in mind if you’ve torn off a wall and discovered there’s little room for a vent pipe. Always check your local codes with a plumbing inspector to ensure you can use the AAV. Related reading: How to Install a Plumbing Hole in 7 Steps to Vent Your Pipe with A Well Plumbing Vent Diagram That’s it. Now you know the proper ventilation inlets and outlets for your sewage pipe and are ready to tackle this aspect of your renovation project. Remember to use the best possible setting based on the location of your fixtures and refer to these diagrams to ensure you are setting up your vents correctly. Have you used your plumbing hatch planner and DIY skills to remodel your kitchen or bathroom? Share your experience in the comments below.