Described herein are devices, systems, and methods for providing suction. In some cases, the suction is generated passively. A passive suction device may comprise a structural element, such as a narrowing of an inner diameter of a hollow segment, configured to create a Venturi effect. A passive suction device may comprise a structural element, such as a conduit formed between two facing surfaces, configured to create a Coanda effect. A passive suction device may comprise a structural element, such as a wing shape or fan shape, configured to create a Coanda effect. A passive suction device may comprise one or more structural elements to create a Venturi effect, one or more structural elements to create a Coanda effect, one or more structural elements to create a Bernoulli effect, or any combination thereof.
