If you don't know what a dumbwaiter is exactly or are eager to explore the different models and options available, then this article is for you. We have compiled all the "must-know" information on dumbwaiter design, mechanics, and costs. If you don't know what a dumbwaiter is exactly or are eager to explore the different models and options available, then this article is for you. We have compiled all the "must-know" information on dumbwaiter design, mechanics, and costs.