[MagpieGlass]

LOL Thanks again Phill. You are awesome.

Here's the horrible caveat. We have a two story house with a walk out basement (aka three story house). I'm putting the studio in the area of a retaining wall on the bottom (aka basement floor) So I need one very long stack and I think it might excite the township zoning ordinance.

I copied and pasted your other info for him and will do the same with this. My thought was activated charcoal to grab the big stuff on the way out. I think he is actually looking at putting the exhaust underground and venting it away from the houses (towards our storm swale).

It should be fun to see what he comes up with ... Engineer in his first life, went back to school for his computer science degree and then sixish years ago went back to school and got his project management cert. and MBA. I tease him he has more letters after his name than are in his name at this point in time.