Ever burned something? Just painted the basement? Did your wife squeak out an especially stinky one? Never fear - Fan Frame is here!
Each kit affixes one standard box fan to the door so you can stack them on top of each other and achieve up to 3X more air volume than is otherwise possible (assuming 3 fans).
This also insures air blows through the house instead of just around the house. 1 fan in a doorway actually results in some of the air looping right back inside through the opening at the top of the door.-- davea0511, Oct 17 2007random, halfbakery