Laboratory facilities remain expensive to operate because of the extraordinary volume of once-through exhaust air required by chemical fume hoods. Traditionally, laboratory fume hood operation is perceived as a laminar flow process to capture and contain contaminants inside the hood, and relies on face velocity to establish the volume of air required when the hood is in use. Conversely, vortex fume hood operation is understood as a dilution process that utilizes turbulence to dissolve and contain contaminants in the air stream and employs air changes per minute to establish the volume of air that passes through the hood.
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