Title: Exchange means in/out runs at same time.
Review: The exchange air feature means that while one fan draws outside air in, the other draws inside air out. But since the edges of the fans are about 2 inches apart, some portion of the air just drawn in is immediately pulled out. I could not feel much air movement 8 inches from the front on the fan blowing in. Alas, the best automatic operation I can get is to exhaust air when inside temp is above a certain temperature during the day. I have to manually change the fan direction to draw in cooler outside air at night.
Is this product review negative?