![]() This method is one of the three remaining methods of such venting that are more often found in a horizontal application.Ī fixture is said to be wet vented when it serves also to carry the discharge from fixtures connecting into the drainage system at a higher level. These two methods of using the drain as a vent, common venting and waste stack venting, are, for the most part, vertical in their application. In other words, if the fixture unit total would require a 3-inch-diameter (76 mm) drain per Table 913.4, then both the stack and its vent must be 3 inches (76 mm) in diameter with no offsets at all until at least 6 inches (152 mm) above the highest branch interval (see diagram). Note for reference: the size of the stack, which is based on the total branch intervals, shall be maintained the same size from the lowest point of the stack to the vent termination or connection to another approved vent. The size of the waste stack vent is to be in accordance with Table 913.4. Once the highest branch interval is connected to the stack, the vent portion may contain offsets, provided such offsets are at least 6 inches above the branch interval connection. For this system to function effectively there cannot be any offsets in the waste stack portion. It greatly extends the concept of a vertical common vent, except for some specific guidelines for installation. This is a very simple method of allowing a drainage stack to serve as a vent. The sizing of common venting is specified in Table 911.3. The following diagrams show some of the various approaches to common venting. The two traps and their fixture drains can be either at the same level or at different levels, provided that they are on the same floor. This very simple concept allows two traps to be vented by the same vent. These venting provisions offer the installer and designer different paths to achieving an adequately vented system that could result in cost savings along with ease of installation in different types of construction. In this third of a four-part series of articles, we cover three of the remaining six venting methods for which the IPC is probably best known : the c ommon v ent, the w aste s tack v ent and w et v enting systems. The venting methods have also been field-tested, establishing a long history of satisfactory service. The methods have been laboratory tested to determine sizing and installation requirements that provide proper venting to a drainage system. You will find that these venting provisions offer the installer and designer different paths to achieving an adequately vented system, which could result in cost savings along with ease of installation in different types of construction.Ĭhapter 9 of the IPC describes a variety of methods to vent plumbing fixtures and traps. The various approaches to venting that are permitted in the 2021 IPC are described in this handy reference tool authored by Lee Clifton, senior director of PMG resources at the Code Council. The International Code Council is proud to distribute a helpful tool - Methods of Venting Plumbing Fixtures and Traps in the 2021 International Plumbing Code: Installation, Flexibility and Opportunity for Savings - to help expand your knowledge of the International Plumbing Code (IPC).
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