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DIN EN ISO 29461

Test standard for air intake filter systems for rotary machinery

DIN EN ISO 29461-1 represents a test method for determining the performance of particle air filters and filter inlet systems for rotary machines. This applies, for example, to stationary gas turbines, compressors and other stationary combustion engines.

"The standard applies to air filters with an initial efficiency of up to 99.9% for particle sizes of 0.4µm. The process is intended for filters operating at flow rates ranging from 0.25m³/s (900m³/h) to 1.67m³/s (6,000m³/h). The standard refers to static filter systems but can also be applied to other filter types.


The test according to ISO 29461-1 includes:

  • testing the initial pressure difference
  • testing the initial separation efficiency
  • media test
  • testing the separation efficiency