Installing Washing Machine Drain Pipe Vent

In some areas you legally have to install a washing machine drain air vent but in other areas you don t.

Installing washing machine drain pipe vent.

The fixture on the left is a washing machine drain box. When hooking up a new washing machine some people look for a convenient drain line and simply install a pipe that extends to the washer. This is the purpose of a venting system. This is a vertical pipe connected to a p trap which then connects to a drain.

Washing machine drain vent 2 inch pipe for washing machine drain. You only have to remember this the sanitary tee that serves each fixture is the place where the trap arm drain and vent come together. Standpipe 24 inches above p trap. Trust me you don t want a short circuit on top of the whole clogged drain problem.

A sturdy 2 inch pipe will work well as a standpipe. However experts propose that the best way to ensure the proper draining of the washing machine is through the installation of a standpipe. No vent 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. There is more plumbing vent pipe in this photo than drain piping.

The vent will usually rise straight out of the sanitary tee that the p trap is connected to. You can see the 2 inch drain pipe leave the box and go into a p trap. In some installations it may connect directly to the drain line near the trap. If the drain lines in your home have poor venting as in figure a for example water rushing down the drains will pull water from nearby p traps.

As water goes down a drain air is needed to equalize the pressure in the drain line. If they omit the trap and vent it s a mistake that can. Branch arm to vertical stack. A good working vent is especially important for washing machines since they discharge so much water at one time.

The piping in the photo on the left represents a laundry sink drain while the photo on the right depicts a washing machine s stand pipe. In each a is the vent b is the trap arm and c is the drain.