Snow particles intruding in my building

My neighbours has a snow generator. The particles can be seen inside my building along the nearest wall to him. We have discussed this and neither of us has found a way of blocking the particles at the bounary. I don't want to insist he removes it. Does anyone know a way of stopping the particles passing through my wall.

Thanks. Cap.

Hello Captain. I am not sure how to help with this. The script may be able to be modified to reduce the radius of the particles. Let me know if you need more help, good luck, and thanks for working with your neighbor on this.