Purair® Advanced The Purair® Advanced Series ductless fume hoods are a series of high efficiency products designed to protect the user and the environment from hazardous vapors generated on the work surface. At the heart of the Purair® fume hood product line is the innovative Air Science® Multiplex™ Filtration Technology that creates a safe work environment over the widest range of applications in the industry. APPLICATIONS Capsule Filling Chemical Sampling Dental Labs Drug & Chemical Analysis Forensics Histology Ink Fumes Light Grinding Pharmaceutical Pipetting Slide Staining Spray Adhesives Weighing