Kitchen Sink Vent Diagram

Kitchen Sink Vent Diagram

GeorgePeters / Getty Images A sink vent is a necessary part of the drain for any sink. The purpose of a sink vent is to help prevent a vacuum that can occur when the sink is full of water. Allowing air into the drain through a sink vent will help keep the drain flowing properly. In most houses the sink drain line will go into the wall where it will connect with a sanitary tee that splits; going down for the drain and up to the exterior vent where it can release sewer gas and allow fresh air into the line helping water from the fixture to drain quickly. In mobile homes and some site-built homes the sink drain goes down after the trap and does not have a vent at all. If the drain does not have a vent in the wall it should have one under the sink. Venting a sink locally can be accomplished with an auto vent.Auto vents or air admittance valves work by letting air into the drainage system when the fixture is used while keeping any of the sewer gas smell from coming back into the house through the valve. It is common for mobile homes to have auto vents installed under bathroom sinks.If your sink is draining slowly and it isn’t due to a drain clog it could be a sink vent issue. If the sink is connected to a roof vent it may be a good idea to consult a professional plumber. For a sink that is vented locally with an auto vent it could be that the vent is not working properly and you may need to replace it.Installing an auto vent to vent a sink is fairly easy, whether you are replacing an old existing vent or putting one in where there was no vent to begin with. Installing a sink vent can help with sink drainage dramatically.To install an auto vent sink vent:Remove the old trap and drain pipes from under the sink so you have plenty of room to work. You will need a sanitary tee, auto vent, extra pipe, a coupling threaded on one side to screw in the new vent, a regular coupling if you need to extend the height of the drain, and new trap if you are installing one.  Put the trap together and put it loosely on the bottom of the sink pop up drain so you can determine what height to bring the sanitary tee up to. Plan out the layout of the various pipes and fittings. It’s a good idea to leave as much room under the sink as possible by keeping the drainage pipes toward the back while making sure they are still accessible if you have to remove the trap. Plan to position the auto vent as high up under the sink as possible while keeping it accessible for service in the future. Dry fit (put the pipes together without glue) all of the pipes and fittings in position under the sink. I believe it is necessary to dry fit the fittings the way you planned to make sure everything lines up before applying glue. Once everything lines up the way you want remove all of the drain parts and glue each piece into position. Mark the fittings before you remove them and glue them if you have angles that are hard to match. Double check that each joint is glued. Leaving a fitting unglued is very easy to do when working with abs pipe since the fittings and the glue are both black. Put some plumber's tape on the threads of the auto vent and screw it into position. Now you are ready to test the drainage. Let water run to check for leaks and then fill up the sink and drain it all at once to verify that it drains properly and that there are no leaks when a large amount of water is draining.  Read More
kitchen sink vent diagram 1

Kitchen Sink Vent Diagram

A sink vent is a necessary part of the drain for any sink. The purpose of a sink vent is to help prevent a vacuum that can occur when the sink is full of water. Allowing air into the drain through a sink vent will help keep the drain flowing properly. In most houses the sink drain line will go into the wall where it will connect with a sanitary tee that splits; going down for the drain and up to the exterior vent where it can release sewer gas and allow fresh air into the line helping water from the fixture to drain quickly. In mobile homes and some site-built homes the sink drain goes down after the trap and does not have a vent at all. If the drain does not have a vent in the wall it should have one under the sink. Venting a sink locally can be accomplished with an auto vent.Auto vents or air admittance valves work by letting air into the drainage system when the fixture is used while keeping any of the sewer gas smell from coming back into the house through the valve. It is common for mobile homes to have auto vents installed under bathroom sinks.If your sink is draining slowly and it isn’t due to a drain clog it could be a sink vent issue. If the sink is connected to a roof vent it may be a good idea to consult a professional plumber. For a sink that is vented locally with an auto vent it could be that the vent is not working properly and you may need to replace it.Installing an auto vent to vent a sink is fairly easy, whether you are replacing an old existing vent or putting one in where there was no vent to begin with. Installing a sink vent can help with sink drainage dramatically.To install an auto vent sink vent:Remove the old trap and drain pipes from under the sink so you have plenty of room to work. You will need a sanitary tee, auto vent, extra pipe, a coupling threaded on one side to screw in the new vent, a regular coupling if you need to extend the height of the drain, and new trap if you are installing one.  Put the trap together and put it loosely on the bottom of the sink pop up drain so you can determine what height to bring the sanitary tee up to. Plan out the layout of the various pipes and fittings. It’s a good idea to leave as much room under the sink as possible by keeping the drainage pipes toward the back while making sure they are still accessible if you have to remove the trap. Plan to position the auto vent as high up under the sink as possible while keeping it accessible for service in the future. Dry fit (put the pipes together without glue) all of the pipes and fittings in position under the sink. I believe it is necessary to dry fit the fittings the way you planned to make sure everything lines up before applying glue. Once everything lines up the way you want remove all of the drain parts and glue each piece into position. Mark the fittings before you remove them and glue them if you have angles that are hard to match. Double check that each joint is glued. Leaving a fitting unglued is very easy to do when working with abs pipe since the fittings and the glue are both black. Put some plumber's tape on the threads of the auto vent and screw it into position. Now you are ready to test the drainage. Let water run to check for leaks and then fill up the sink and drain it all at once to verify that it drains properly and that there are no leaks when a large amount of water is draining. 
kitchen sink vent diagram 2

Kitchen Sink Vent Diagram

How will the drain be vented? That’s the first question to answer as you plan for plumbing a new appliance or an addition to your system. When developing a plumbing system plan, you may choose from several venting types; each option may present problems or complications. Before finalizing a plan have the venting scheme approved by the local plumbing inspector. Vent types A true vent is a vertical pipe attached to a drain line that travels through the roof with no water running through it. If a fixture is close to the stack and on the top floor, the upper part of the stack serves nicely as a vent. Many fixtures are not so conveniently located, however, and other solutions must be found. A revent pipe, also called an auxiliary vent, attaches to the drain line near the fixture and runs up and over to the main vent. It may attach directly behind the fixture or to the horizontal drain line. If two fixtures are on opposite sides of a wall, they may tie into the stack with a sanitary cross; this is called a common vent and can be found on back-to-back sinks. When a fixture is close enough to a stack, a wet vent may be allowed by code. In the case of a tub that is close to a stack, its drain may empty into a pipe that also serves as a vent. For a freestanding sink code may allow a loop vent. If reventing is difficult and wet venting isn’t allowed, you may have to install a separate vent pipe through the roof. An air admittance valve (AAV) opens to let air in when waste drains, then gravity closes it to keep sewer gases from escaping back into the room. Codes in many localities allow these relatively new devices to take the place of vent lines. Depending on the size of the unit and any code restrictions, AAVs can be used to vent multiple fixtures. Check codes to make sure they permit AAVs. The critical distance When you’re remodeling your plumbing system, can you install a wet vent, or do you have to install a revent or a separate vent? Finding the answer can involve complicated calculations, based on formulas that can vary from one locale to another. The size of the pipe that codes require, the type of fixture you want to install, and the number of fixtures that are already wet vented on the same line are three factors that determine the critical distance — how far the fixture can be from the vent pipe. Measure the length of the pipes carefully and consult a plumbing inspector to determine whether wet venting is possible. Installing vent pipes Vent pipes, often narrower than drainpipes, need not slope like drainpipes. Normally they run level or plumb, unless there is an obstacle to work around. 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 horizontal portion of a revent pipe must be at least 6 inches above the fixture’s flood level — the highest point to which water can rise. (On a sink the flood level is the sink rim or overflow hole.) The main drain Plan drain lines to minimize the possibility of clogs. The general rule is that smaller drainpipes — 1-1/4 inches for bathroom sinks and 1-1/2 inches for kitchen sinks, for instance — lead to larger branch drains. These in turn lead to the main stack, which is the largest pipe of all — typically 4 inches. Because the main stack is also vertical, it will rarely clog. The main stack leads down into the ground, then out toward the municipal sewer. The underground horizontal pipe, or main drain, that runs toward the sewer line can sometimes get clogged, especially if it is an old drain made of clay pipe. Typical Venting Alternatives A true vent pipe must remain dry while water runs down the drain. A wet vent also serves as a drain line but is large enough that it never actually fills with water. Venting with an Air Admittance Valve (AAV) Window framing in this wall prevents installation of vent line, so an Air Admittance Valve (AAV) is installed instead. Other Venting Options Here are other common ways to tie vents into a stack. Check local codes to see which methods are accepted in your area, then choose the method that requires the least number of holes or notches in studs.

Kitchen Sink Vent Diagram

Kitchen Sink Vent Diagram
Kitchen Sink Vent Diagram
Kitchen Sink Vent Diagram
Kitchen Sink Vent Diagram

Leave a Reply

Your email address will not be published. Required fields are marked *