Abstract
After reviewing available information and carrying out appropriate tests, the Working Party has recommended that a correct aerodynamic design of fume cupboard will require an air velocity of 0.5 m/s under working conditions. Variations in air velocity across the working face should not exceed ±15%. If it is essential that under no circumstances should transient escapes of material take place in the operator's breathing zone, a face velocity of 0.76 m/s may be necessary. Under these conditions the use of a total enclosure is preferred. The Guide includes recommendations for the design and installation of fume cupboards to meet these criteria.

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