The plumbing vent line is a short pipe, which is almost hidden, but makes a tiny appearance where it protrudes a few inches from the roof of your house. The vast majority of people are probably in the dark about its purpose, but it plays a vital role in preserving the healthy environment of your house, as I will explain. While it does its work silently, 24 hours a day, seven days a week, the tiny pipe can become stopped up due to dead leaves, dead animals and snow and as a result from time to time becomes blocked up in the late fall or winter. To understand the task of the vent line we have to first appreciate the mechanism by which houses drain, and how the drainage system prevents sewer gases from refluxing into the house. The outflow pipes that runs from the house to the sewer line are alternatively called the drain, waste vent system, or DWV. This outflow system provides for the outflow of water from sink drains as well as waste from toilets. The plumbing vent line, which goes up to the roof, is responsible for maintaining stable air pressure within waste vent system This has important implications for the safety of the home.When drains are not being actively used, they fill up with air. The sewers is also full of air, however, sewer air is dank and foul. It is necessary for home safety that the two air masses have no contact with each other, as such a communication between the two compartments would permit foul odors and diseases to readily enter the home environment. Fortunately, the two bodies of air are kept apart by a tiny device called the plumbing trap. Plumbing traps are "P" or "S" shaped sections Syma s107 upgrade of the outflow drain. Between drain uses, water pools in the traps' curved bottom, and this standing water effectively blocks reflux of the sewer gases. An essential function for the home! When the sink or tub drains, the newly draining {water displaces the standing water that was sitting in the curved portion of the trap and takes its place. And therefore, there Syma s107 upgrade is always water filling that segment of the trap and serving as a block against reflux of sewer gas. When the drain is in use, water squeezes the old water out of the trap and down the drain pipe and subsequently some of the newly draining air swimmers water replaces it and will now fill the curved part of the plumbing trap and protect the home from the invasion of sewer gas. However there is a threat to this system's balance, which comes from the air pressure equilibrium in the enclosed environment of the drain system. As the bolus of water flows down the drain from the toilet, sink, tub, or shower, it flushes out the air in the drain system before it and flushes it down the pipe. This subsequently creates reduced air pressure in the area of the pipe slightly under the water trap. If nothing is done, the reduced pressure zone will pull water out of the "P" or "S" trap via a siphoning effect, creating an opportunity for sewer gas to pass back through the now empty trap, out the drain, into the sink, tub or shower, and into the house. To stop this sewer gas invasion from occurring, all drain pipes contain a pipe, which goes out from the air swimmer drain pipe in a vertical direction and at a perpendicular angle. This pipe travels up towards the roof of the house and connects, in parallel, with identical pipes from other drains to form a single vertical pipe that pierces the roof. When air pressure in the drain system drops, air is sucked back into the house through the vent pipe, which equalizes the air pressure in the drains, and prevents the backflow of noxious sewer gases. The air vent system constantly prevents dangerous pressure changes from ensuing in the pipe system. However, if the vent pipe gets clogged by dead animals, ice, snow, or leaves, it will be unable to perform its job. Should this happens, the air fails to equalize in the pipe system and the householder will begin to hear a strange gurgling sound in his drains, which actually signifies that siphoning is taking place as water is pulled out of the traps. If a home owner hears this sound, he must call a plumber to clean out the vent line, as the entrance of sewer gas can be dangerous. The plumber will climb onto the roof and clear the debris.
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