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Observator 100 years

Airflow Grids

Fow grids will transmit a comparable and repeatable differential pressure proportional to the average air flow, however turbulent the in-duct conditions and with no moving parts long term reliability is assured.

Designed for a wide variety of temperate and environmental conditions they are often found in applications where many other flow measuring devices are unsuitable.


  • Choice of standard, radial, ‘U’ and ‘X’ grid formats to best suit your application
  • Suitable for clean air velocities between 1.5 and 30 m/sec (6000 ft/min)
  • Very low system resistance with magnified output signal for up to 2.5 times greater than velocity pressure
  • Maintains accuracy, even in tortuous system designs
  • Stainless steel construction with plastic and alternative material versions to special order
  • Standard versions suitable up to 80°C with all-welded units up to 450°C
  • Mounting options include side plate fixing or “Ready to fit” in-duct sections
  • No moving parts and minimal maintenance required
  • Optional honeycomb flow straighteners and duct flanges available
  • Airflow sensing points conform with BSI042 Part 2A
  • Perfect for HVAC, building management systems, process control, R&D and wind tunnel air flow monitoring

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