Re: wave ventilation
I do not notice any additional problems re a/c or other cooling since i use an exhaust fan in the main house at night on hot days. In my area the nights are very cool and by the time the house gets very hot it is already cool again. The drawback is that the winters are very cold.
That said getting back to the circulation question, I have a steel hatch with a screen/glass storm door behind it.In summer i use the screen and the air from the new system comes mostly from that area. I can actually see large gaps where the air can get in.
There is enough opening to accomodate the fan plus any air the oil burner needs. The $1700 system suggests that the air comes from all over the house. the way i have it set up the air circulates in the basement only.