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Why do you need a drain vent on a washing machine?

Why do you need a drain vent on a washing machine?

Vacuum. It allows air in which prevents the possibility of a vacuum forming that could affect the water draining from your washing machine. You should also install a vent if your washing machine is more than 4 feet from the vent stack, as this will make sure there’s ample to for the washing machine to drain properly.

Do you need a drain line for a washing machine?

Remember that vent lines MUST be sloped so they drain water towards the sewer. You never want standing water in a vent line. Note the pipe sizes. It’s very important that a washing machine has a 2-inch drain line up to where it connects to the main stack.

How big is the vent in a half bath washing machine?

The dashed lines are vent lines and note the one vent line for the half bath is a full-sized 3-inch vent that goes up and through the roof. The pipe that drains the lavatory sink is 3-inch in diameter because that drain line also acts as a vent for the toilet.

Do you need a cheater vent for a washing machine?

The washing machine is usually on a lower floor, and running the vent upstairs to tie into the main vent can involve a certain amount of wall repair. To avoid this, some plumbers install an air admittance valve — sometimes called a cheater vent.

Can a washing machine drain pipe be vented?

NEVER install a washing machine drain pipe and vent like this. Look at MY drawing below. Kevin, the answer is NO.

Do you need an air vent for a washing machine?

In some areas, you legally have to install a washing machine drain air vent, but in other areas, you don’t. Unless mandated by building codes, if there’s a gap around the drain tube for the washing machine where it enters the drain, you probably won’t need to install a vent, as there will be ample air to prevent the formation of a vacuum.

Remember that vent lines MUST be sloped so they drain water towards the sewer. You never want standing water in a vent line. Note the pipe sizes. It’s very important that a washing machine has a 2-inch drain line up to where it connects to the main stack.

The dashed lines are vent lines and note the one vent line for the half bath is a full-sized 3-inch vent that goes up and through the roof. The pipe that drains the lavatory sink is 3-inch in diameter because that drain line also acts as a vent for the toilet.