![]() Some people also define it as the bottommost part of the vent stack. In the above section, I defined a stack vent as the uppermost pipe of the waste stack just above the highest fixture. Do You Have/Need a Vent Stack or Stack Vent? Image Credit: NextDay Inspect Commercial buildings on the other hand have a vent stack and stack vent. Most residential houses in the United States (and pretty much elsewhere in the world) have a stack vent. Houses can also have both a vent stack and a stack vent. And that is where most people get lost in the definition.Ī house can afford not to have a vent stack but it should always have a stack vent. The definition of a stack vent changes depending on the type of the house being vented. Vent stacks on the other hand allows sewer gases to exit the drainage system (instead of the drain lines) and also introduces air into the drainage system so that fixtures can drain fast and toilet can flush better. The drain and waste stacks channel wastewater out into the municipal sewer line or septic tank. In short, the vent stack is connected to the waste stack and drain stacks, and sometimes back to the waste stack via the stack vent. The main difference between a vent stack and a stack vent is that vent stacks are only used to vent the drainage system and found in multi-storied buildings while stack vents can be used for both venting and drainage and are found in single and multi-storied buildings. Vent stacks and stack vents can be connected together at the highest levels of the house (as shown below) or each pipe can exit through the roof separately. On the other hand, a stack vent is the uppermost pipe section of the waste stack above the highest fixture. So, what is the difference between a vent stack and a stack vent?Ī vent stack is a vertical pipe parallel to the waste/soil to which all floor drain vents are connected. A vent stack and a stack vent are two terms that most folks used interchangeably but they shouldn’t.
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