Drive-thru specification is a term used to describe the SIZE and design of a drive-thru window. It is important for businesses that offer drive-thru services, such as fast food restaurants, banks, and pharmacies, to have a well-designed window that meets their needs. The SIZE of the window is an important factor in determining the efficiency of the drive-thru service. The SIZE of the window must be large enough to accommodate customers and their orders, while also allowing employees to easily access the window from inside the building. The design of the window should also be taken into consideration, as it should be easy to open and close, and provide adequate visibility for both customers and employees.