I am also getting worried about annoying my neighbors.
When I had my beta unit it was just parked in my office with exhaust out a window into the back yard.
Now that I have my production unit I am moving it into its home in the basement. I plan to exhaust into the median between us and a neighbor that is maybe 12’- 16’ (never actually measured). Within the last month some new people have moved in to that house, and not only do we actually like them, but they have a 2 YO whose bedroom window is right above the ground level exhaust spot. 
I was testing some wool felt last night and I went outside to give it the sniff test. Yuck.
Now I am researching a straight forward DIY filter using off-the-shelf parts loosely based on this one Fume Coffin.