[jyl]

Yeah, I'm resigned to using a fan for the MUA. So won't achieve goal (4).

I'm trying to avoid having to condition the MUA, so don't want to tie it to the existing central heat/ac system. I'm trying to achieve this by having the MUA enter the room, pick up the grease/smoke, and exit the room, with a minimum of involvement by existing room air.

There is a basement under the range location and the basement stairwell behind the range wall, with the exterior 12' away (and not a pretty part of the exterior either) so there is reasonable access for ductwork and I can put fans etc there.