Lumex Select Alternating Pressure / Low Air Loss Mattress SystemThe Lumex Select Alternating Pressure Low Air Loss Mattress Systems are specialized mattress replacement units that utilize low air loss technology with a specialized mattress design that provides pressure management for the treatment of pressure ulcers. The 2: 1 alternating function provides active prevention for pressure relief, especially for those in acute care and long term care settings (the cells inflate and deflate in a 2: 1 cycle, meaning 1 2