No. You vent air from a sewer line.
It allows sewer gases to safely escape.
Water Jetting
An air admittance vent is a mechanical sewer vent which allows air to enter into the sewage system but does not allow exhaust of sewer gases.
It must be plugged up. try to snake it out.
The purpose of air vent on pipe works of infrastrucure
It depends upon the venting that is used, look for your vent pipes on the roof and see if any are close to open windows. If you find a particularly close vent pipe (and you home has several vent pipes) you can add a "Studor Vent" to the top of the vent. A Studor vent is the equivalent to a one-way air valve that only allows air to pass, or be drawn, into the pipe, so that sewer gases will be greatly reduced. You don't even have to use pipe cement/adhesive to secure the Studor Vent.
A vent pipe is located afte a fixture trap to remove dangerous fumes from the system and exhauts them through the roof terminal as the fresh air enters through the fresh air inlet
By removing foul sewer fumes and venting them to the outside air nomally through the vent terminal knowing warm air rises
Yes
Vent piping is a pipe that runs outside and is connected to the drain line of your home. this helps the water in the drain to move to your septic/sewer.
Sounds like your washer doesn't have a connection to your "stack pipe". As water moves through a drain pipe, it creates a vacuum behind it, the "stack pipe" or "vent pipe" is usually a pipe that goes through the roof of your house and provides an open air connection to all of your plumbing fixtures so the vacuum is provided a way to suck air rather than sucking the water out of your "P" traps or other fixtures such as your toilet. Chances are your toilet is also "sucking" from your washer, but you just don't notice it. It is also dangerous because if the washer or other fixtures are sucking water out of your "P" traps, then you may be getting methane and other sewer gases into your house. Have a pipe run from washer drain to your vent pipe and this should eliminate the problem. Be sure it connects to the vent pipe because if you ever have a sewer backup, the vent system won't allow the gray water to empty into your house through the air pipe.
The vent terminal is allowing down drafts to enter thus one would have to install a return bend on this pipe to prevent the air from entering but it will allow sewer fumes to escape