Enclosures and systems that can control airflow and signal connectivity in a blade enclosure are provided. Some examples include a front section including a number of blade server modules, a rear section including a number of switch modules; and a middle section having a number of openings and a number of connectors, wherein the middle section controls airflow between the front section and the rear section in the blade enclosure with the number of openings and the middle section controls signal connectivity between a number of blades in the number of blade server modules and a number of switches in the number of switch modules with the number of connectors.