The ventilation fan arrived and was plumbed up in the spirit of portability despite its large 12 7/8" x 12 3/4" x 10" size and 17 lb weight its easy enough to move.
Model / Air King AK200LS 1.4 sones , 200cfm
Its intake is facing the ceiling to vent the warmest air
Speeds: 1
Design: squirrel cage
Continuous running: yes
Power rating: 60w
Actual draw: 43w
Fan noise s reported to be 1.4 sones that increases proportionately to the pressure or restriction put on it.
I noticed the fans noise increased after being plumbed to 20 feet of flex duct with two 90* bends. Its still much quieter then the AC
The AC was moved from the left side near the vent over to the right side with window access.
Its the first day with the vent so far I can say the upstairs has warmed up 1* and its nearly silent upstairs except for the low whoosh of warm air leaving the flex pipe at the top of the stairs.
The downstairs room is 17x11 x8' = 1400cu.ft the fan will be left running 24-7 to maintain thermal continuity between the upstairs and down.
In closing
The next weeks weather is wet and warmish with 10c average temperatures and 100% humidity along with fog. That weather makes for more defrost cycles but so far unit deals with it without issue.