Air flow testing and air exchange rate

The purity of the air in cleanrooms is ensured by means of multi-stage filtering and high airflow. With regard to the way that cleanrooms are aerated and ventilated, there are two basic cleanroom systems. Either turbulent or low-turbulence flow is used. For cleanrooms with turbulent dilution flow, the filtered clean air is introduced to the cleanroom in a turbulent manner and the “mixed air” is extracted. This enables continuous dilution of the particle concentration. To achieve a higher air exchange rate, a laminar flow cleanroom is required in cleanroom classes ISO 1 to ISO 5. In this case, a continuous, low-turbulence displacement flow is used. For this reason, flow velocity, total volume flow and the calculated air exchange rate are among the crucial parameters of your cleanroom. DIN EN ISO 14644-3 lays down rules on how measurement can be carried out in turbulent as well as in low-turbulence flows.

  • Adherence to the guidelines and stipulations on indoor air quality by measurement of the flow velocity and the volume flow in cleanrooms
  • Determination of the air exchange rate in a plant with turbulent mixed air via the total volume flow rate
  • Measurement technology according to DIN EN ISO 14644:2005 Part 3

Specific measuring instruments for air flow measurement

Air volume flow

Measure the air volume flow with a volume flow hood (capture hood), which captures the entirety of the air emitting from every terminal filter or air supply diffuser.

  • Volume flow hood for ceiling outlets for measuring volume flow DIN EN ISO 14644-3
  • With unique volume flow straightener for precise measurements at swirl outlets
  • Calculation of the air exchange rate and creation of reports

Air velocity

Measure the air flow velocity precisely in a duct or at a vent, calculate the air exchange rate, and document all air flow velocity parameters with precise measuring instruments.

  • Adherence to the requirements of DIN EN ISO 14644-3 for hot wire anemometers and vane anemometers
  • Exact measurement of flow velocity and volume flow in a ventilation duct or at a ceiling vent

Application example

Compliance with hygiene standards via the measurement of prescribed air exchange rates in cleanrooms

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