They don't cost much if you don't have much ducting to run, and especially since you probably won't even need an extra HVAC for your set up (nice weather in the bay area and all). Just need a exhaust fan and a fresh air intake, and a good seal keeping the air from the rest of the house. An airlock room wouldn't be the worst idea to keep the smoke out of your house. I've thought about this a lot, if you can't tell.
2/16/15 at 8:04pm