EN14175 Tests

The EN14175 comprises of a series of containment tests besides the normal face velocity tests. The containment tests include, the Inner Measurement Plane Tests, Outer Measurement Plane Tests and the Robustness of Containment Test. The challenge gas which is released into the fume hood is 10% SF6 and 90% N2. A set of sampling probes is positioned at various predetermined locations to monitor SF6 escaping from the hood.

For the inner and outer measurement plane tests, the detector probe set is moved accross the sash opening at various heights and sash positions, thereby describing the overall containment efficiency of the fumehood under normal operations. In the case of the robustness test, a vertical plank mounted perpendicular to the sash plane is made to run to and fro accross the sash opening at a fixed speed. This disturbs the inflow and gives an opportunity for the SF6 to escape. A reliable fumehood ensures that at that level of disturbance, the fume hood is still able to quarantine the released SF6.

For conformity evaluation, a type test is carried out on one of Esco's EFH units fresh off the production line. And thanks to Esco's design, the EFH passed the performance requirements of EN14175.

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