I am looking for some feedback: I am working on a 3850 sq ft house in So. Cal., Castaic to be exact. It will be well insulated and air sealed (blown in blanket [fiberglass] in 2x8 with an R-4 continuous on the exterior. It has a 44' long x 22' high x 23' wide Kitchen-Great room with a cathedral ceiling. Manual J calls for only 340 CFM total, but how to throw that all the way across the 44 ft long room to achieve adequate mixing in such a cavernous space? Even a tiny 12x4 (Truaire) only has a throw of about 30 ft and that is with a NC of 40 which is starting to make audible noise. Thoughts suggestions?