The Independence I and II are designed to stack in a room size plenum. This wall of Air Scrubbers (tm) provides you an infinitely variable cleaning system. The Independence is to be serviced from the back which is where we have placed the convent handle. (Shown in the picture). The system automatically disconnect from electricity with a safety switch. The electrical connection is restored when the "drawer" containing the reactors and UV lights is returned to its "run" position