Bryant 394JAZ is a furnace twinning kit that permits two furnaces of the same model and size to operate as a single unit on the same duct system. This kit can be used to twin standard furnaces with intermittent ignition systems, providing lower operating costs. Twinned furnaces are the solution to heating demands greater than a single furnace can meet. Features include: - FACTORY-WIRED—All internal control box wiring is complete. - TERMINAL STRIP—The 24-volt connections from the thermostat, furnaces, and the twinning control box can be easily made to terminal strips.