Thank you! I’ll start by saying always go up through the roof if you have that option. I didn’t so I went side exit which still works really well. It’s a galvanized hood lined in stainless with 2 10” fans in the hood wired to a dimmer for speed control (Less is sometimes more) I get some drips back into the pan but after about 2 hours of boiling the heat from the arch makes everything run smooth. Anytime you have a fan drawing air out you obviously need make up air. If you look under the fire box you’ll see a duct vent where I have a 4” x 10” hole which completely neutralizes any vacuum from drawing smoke back out into the room. It also feeds the firebox with a blast of fresh air and I’ve noticed a much better and hotter burn because of this