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Stack vent1/6/2024 ![]() ![]() A 3-inch (76 mm) drain would require a 1½-inch (38 mm) vent. Hence, if the drain size is 4 inches (102 mm), a 2-inch (51 mm) vent is required. The drain size is determined by the fixture unit load in accordance with Tables 709.1, 709.2, 710.1(1), and 710.1(2) in the IPC. Remember, the vent size is not based on the trap or fixture drain (trap arm), but the drain size that continues downstream from the point where the vent and fixture drain connect. ![]() ![]() Here we find that the vent must be at least one-half the diameter of the drain served, but in no case less than 1¼ inches in diameter. These individual vents are sized according to Section 906.2. A fixture vent connected in this manner is called an individual vent. Table 909.1 (below) provides the maximum distance allowed for a vent in relation to the trap. The most widely used method is commonly referred to as a conventional venting system. Section 904.1 requires the vent system serving each building drain to have at least one vent pipe that extends to the outdoors. Section 901.2.1 of the IPC establishes that traps and trapped fixtures shall be vented in accordance with one of the venting methods specified in this Chapter. 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. In this publication, we will present the various approaches to venting that are permitted in the 2021 IPC. 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. To help keep in mind that “stack vents” and “vent stacks” are distinct, a short glossary of definitions is provided as well.Ĭhapter 9 of the IPC describes a variety of methods to vent plumbing fixtures and traps.Ĭhapter 9 of the International Plumbing Code (IPC) describes a variety of methods to vent plumbing fixtures and traps. In this first of a four-part series of articles, the various approaches to venting that are permitted in the 2021 IPC are presented. ![]() 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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