CONTAINMENT TESTING OF FUME CUPBOARDS—II. TEST ROOM MEASUREMENTS

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Abstract
Tests carried out on an aerodynamic fume cupboard showed that leakage took place close to the sash. When sampling was carried out closer to the sash than in the British Standards Institution Draft for Development, DD 191, much higher leakage concentrations were found Leakage was found to increase linearly with source flow rate; significantly higher sampling rates than those in DD 191 were found to give a better response from the gas analyser without showing evidence of disturbance to the flow. It was found that, even with an unobstructed entry into the cupboard, the leakage did not necessarily decrease with increasing face velocity. With this cupboard, the very high leakage rates found at low velocities fell quickly with increasing velocity but then rose again before falling steadily.

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