The Series 558 Vertical Flow Hardwall Modular Cleanrooms are available in Class 100 to Class 10. They are manufactured from heavy-duty 16 gauge cold-rolled steel, with a white baked-enamel or powder coat finish. Each unit includes full-ceiling HEPA filter coverage with plenum sections that provide uniform filtered laminar air flow to clean areas, with filtered air going to 100% of the available ceiling surface. It uses sidewall blower cabinets to blow air into the upper filter plenums.