In home depot, go to the ducting section for furnices, bathroom fans and such...once there, if you cant find them ask for the "evenair" fans that are made for moving heat from a furnice to rooms far away from the furnice that dont get much heat, say it goes right in the duct. You should see a few different models of the evenair brand fans. Get the one in the tube, the bigger, the more air it moves. In Mellow Man's "Homemade Cool Tube" thread or on the first page of my thread, he has a pic posted of the box, so you know what you are looking for, they are very small, easy to miss. Then just get all the ducting, mix and match ducting pieces until you have everything you need, then get the foil tape to put it all together. It should all be in one isle. HTH.