A fume hood is a laboratory ventilation device that captures and exhausts hazardous chemical vapors, gases, and aerosols away from the operator. These enclosed workstations use airflow directed from the laboratory into the hood to contain contaminants. Fume hoods are essential safety equipment in chemical, biological, and pharmaceutical laboratories.
Technical Details
Fume hoods operate at face velocities of 80 to 120 feet per minute at the sash opening, with typical exhaust volumes of 1,000 to 2,500 cubic feet per minute depending on hood size and type. Variable air volume (VAV) systems adjust exhaust flow based on sash position to improve energy efficiency. Hoods include sash barriers, work surface materials, and baffles designed to optimize airflow patterns and containment.
Applications
Chemical laboratories use fume hoods for volatile organic compound handling. Biological safety cabinets protect operators and samples in microbiology and biotechnology labs. Radioisotope laboratories use specialized fume hoods for radioactive material handling.
Practical Significance
Fume hood performance must be verified annually through flow and containment testing. Improper hood operation or damaged sash seals create serious worker safety hazards and regulatory violations.