Clean Aire II Fume Hoods are a Class 1 ductless hood workstation. Activated Carbon filtration for fumes, odors, non-hazardous chemical vapors. Small quantities of solvents, acids, and annoying odors are absorbed into the carbon filter, that recirculates air back into the room thus avoiding the need for installation and lowering energy costs. The Clean Aire II Ductless Fume Hoods are self-contained ductless hood unit, equipped with integral carbon filter, vapor proof light, vertical sash and controls. They are molded of fire retardant fiberglass, and are shipped completely assembled and equipped, ready for operation.