Originally Posted by gadgtfreek
Surprised at that one, it covers all the venting.
It doesn't sit flat over all that area. It is raised around the perimeter so the fans pull air through all the venting area. It "may" be more effective than two individual fans in the other configuration which leaves much of the vent area open which could result in the fans pulling some air in through them. I don't have any evidence to show that and no doubt either method is better than nothing. I use a window fan to help cool my house and I noticed that it was more effective if I used a panel to cover the exposed side areas. The fan blowing air in would pressurize the room and some air would go back out next to the fan instead of blowing on through the house and out another window. Probably not a huge difference...
Regards, Ken (Retired)
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