It was alot of work, taking apart a commercial fan removing the motor, shoehorning in a bigger one, matching the blade size to the motor, building the frame and mounting the fan ect. But, it fits the window perfectly, is quick to set up and remove with the twist of one fastener. Alot of thought went into it. The room still needs to be emptied, that's the next step. Then hopefully I will get the Spitfire painted this winter.