An equipment front-end module (EFEM) includes a with a load port seat and a transfer robot seat. A fan filter unit is supported by the frame assembly and a controls box encloses the fan filter unit and is supported by the fan filter unit. The rear panel has a tunnel seat, is fixed to the frame assembly, and is separated from the load port seat by the transfer robot seat. One of (a) a plate body with an inboard passthrough and (b) a tunnel body with an outboard passthrough fixed at the tunnel seat and coupled to the frame assembly by the rear panel to space a process chamber with a quad chamber arrangement from the frame assembly differently along a transfer extending through the tunnel seat than a process module having a single or a dual chamber arrangement using a singular EFEM arrangement. Semiconductor processing systems and methods of making semiconductor processing systems are also described.