1.) Don't vent outside. The CO hazard, as so well stated by others, is real, and quite deadly.
2.) Since your problem is with airborne dust particles, an air cleaner is your best solution. Mine isn't in an ideal location (I put it where I had open ceiling space), yet I am constantly astounded how well it cleans the air quickly (tested by my Dylos meter). I think it's been some of the best money I've ever spent in my workshop. I keep an activated charcoal first stage filter on mine, which also helps a little with organic vapors. Every bit helps.
3.) Lots of good advice on modifying your DC system for more SP and flow. I've been very happy that I'm running at least 6" pipes to my equipment. Even with that, the drum sander creates dust particles like you wouldn't believe, but the air cleaner scrubs them quite quickly.
- After I ask a stranger if I can pet their dog and they say yes, I like to respond, "I'll keep that in mind" and walk off
- It's above my pay grade. Mongo only pawn in game of life.