No you shouldn t use a towel or other absorbing material.
Venting into house vent stack in attic.
One static vent style is the turbine vent which uses wind to power its enclosed fan all it takes is a light breeze to rotate the blades and suck heat out of the attic view example on the home.
Or you may have a distance issue.
The vent opening must be far enough above the roof and away from doors and windows to prevent the sewer gases from drifting into the house.
My training tells me this would not be ok because of moisture odors unhealthy gas etc not to mention ability for insulation and mice to go down.
This next image shows various types of vent piping behind a sink giving you a more accurate idea of what those might look in your own project.
The vent stack is the pipe leading to the main roof vent.
Insulating the duct may also help.
However the sink is placed further away.
The high humid air doesn t vent out of the house before it condensates in the duct and then runs back into the house causing damage.
It may seem incongruous to allow cold air into your attic in the middle of winter but attic venting is an important climatic control that protects your house.
Therefore a re vent was added to ensure that sewer gasses could escape.
The code requires a 10 foot horizontal distance from any.
You may have a bad boot around the roof vent that is leaking into the attic.
Due to hoa rules i can t install a gable vent low enough to provide a hot air escape from the garage.
It is a vertical pipe attached to a drain line and runs through the roof of your home.
Additionally i can only add the vents to the lowest section of the garage door.
It is in missouri which i think they may allow aavs on a limited basis but i don t see how this is ok at.
As you can see the true vent aligns with the stack just behind the toilet.
It also allows fresh air into the plumbing system to help water flow smoothly through the drain pipes however no water runs through the plumbing vent pipe.
The attic is another 2 5 ft of ceiling on top of that.