A new type of method and system for designing duct work is disclosed. This system may be implemented using a computer. The system may be designed such that specific information regarding the room, the appliance, and/or other information is input into the computer. Using this input information, along with information that is stored in a database, the system will output a design for the duct work that may include both a cut sheet (for cutting out the duct work) as well as a three-dimensional representation of the duct work that is displayed on a computer.