OZPEN CO₂ Fiber Optics Cleaning Unit For High Power Components Video Instructions. The OZPEN is a versatile, precision, small surface area cleaning system for critical fiber optics and other manufacturing operations. The OZPEN generates and propels an adjustable spray of clean dry air or nitrogen containing small CO₂ particles to efficiently remove foreign matter from a surface. The composite spray cleaning technique is a patented process where one can deliver controlled shear stress on surface contaminants using chemically inert, dry CO₂ spray for efficient and effective removal of inorganic and organic surface contamination from critical substrate surfaces.