- Gas Containment Performance
- Prevention of Diffusion from Contaminated Areas
- Credibility and Stability of Research Environment
- Comfortable Air-conditioning
Airflow control valves (Accel II) control exhaust air volume precisely and swiftly at a response speed of one second or less in accordance with the opening of the fume hood sash, maintaining the fume hood face velocity to 0.5m/s and thus containing gases in the fume hood.
What is the fume hood face velocity?
In Japan, Ordinance on the Prevention of Organic Solvent Poisoning for Occupational Health and Safety Law stipulates that the fume hood front face velocity should 0.4m/s or faster, and Ordinance on Prevention Hazards due to Specified Chemical Substances for the same law stipulates that it should be 0.5m/s or faster in terms of gaseous substances.
In the U.S. technical organizations like ASHRAE (The American Society of Heating, Refrigerating and Air-Conditioning Engineers) and ACGIH (American Conference of Industrial Hygienists) have conducted detailed studies with consideration given to the wind velocity of an air-conditioning system, the room layout, and other peripheral factors. Based on such studies the maximum face velocity of 0.5m/s is adopted in general.
What is containment performance of a fume hood?
Gas containment performance of a fume hood can be checked with ASHRAE110-1995, which is a quantitative method for testing a fume hood's ability to contain gases. In this method, the gas containment performance of a fume hood is tested by venting a tracer gas in the fume hood and measuring the density of the leaked gas.
Movie - A test for fume hood's gas containment performance
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