Actually that downward ventilation comment applies to European cars but not US. My 2 Mercedes literally suck. They suck the air from above the seat and disburse below. This works somewhat OK, but not great. Most US cars I have experienced ventilated seats (Ford and GM) blow cool air (pulled from floor vent under seats) up through the seat. In my Mercedes, I set the vents at their max setting and they just do a somewhat adequate job. In my daughters Buick, I have found that after first setting ventilation to max after getting into a hot car, I quickly have to reduce the ventilation setting to low.
So, it has been stated that the Air “sucks”. Does the Gravity also “suck” or does it “blow”?