A data utilization installation has various components such as a management computer, a mobile computer system, an access point, a printer, and application software. The toner can be suitably used for developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing method and the like. Furthermore, the invention discloses a variable symmetric split ratio approach to improve the number of splits. The logic circuitry is also configured for receiving a set of process data streams, each of which being associated with a specific process recipe. The cross-section shape of the air path changes continuously and smoothly at the in-frame blow-out part and the duct connection part, from the fan outlet to the duct connection opening.