re: Anyone have a vent over their grill/smoker?

I'd look around for more affordable 1200 CFM hoods. I bought one last year, and all of the typical local vendors wanted ridiculous amounts for high-CFM models from the "vanity" brands. Broan and others make more affordable versions that produce just as much "suck" as the fancy names. A 48" wide, outdoor rated 1200 CFM Broan in stainless will run about $1500 list price, you can probably find it online for less.

Or call a restaurant equipment dealer...the commercial versions without fire supression are not as expensive as you'd think. They're not so pretty on the outside, but you can build a nice enclosure.

I keep my BGE in a nest...I can roll it around according to the prevailing winds, meaning no one has to sit in the smoke.