The Series AFMS Airflow Measurement Station is easy to install – All tubing and fittings, airflow elements, transmitters are factory pre-installed to save site work. Optional Honeycomb and integrated volume control damper. The AFMS utilizes an 2% airflow averaging element in a head-type device, generating a differential (velocity) pressure signal as the velocity pressure. Multiple elements are joined together for connection to a differential measurement device (Differential Pressure or Airflow) for flow measurement and indication purposes