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Ruskin®DFi-RT Fan Inlet Airflow Measure Device

Ruskin®DFi-RT Fan Inlet Airflow Measure Device

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Ruskin® introduces the TDFi-RT (Thermal Dispersion Fan Inlet – Real Time), a unique air measurement device for fan inlets utilizing thermal dispersion technology to establish both airflow rate and air temperature for a building’s automation system. This information allows the building’s automation system to automatically control speed of the supply, return or exhaust fans and adjust damper positions to maintain HVAC airflow requirements.
The TDFi-RT uses standoff cantilevered sensor mounting to properly position the sensors in the air stream and minimize hardware located in the fan’s inlet. This mounting concept allows the sensors to measure airflow rate by monitoring both the rate at which heat is dispersed from its heated thermistor and the overall ambient temperature of the air entering the fan from its passive thermistor. One or two sensors can be used per fan inlet. The TDFi-RT air measurement system can collect information from up to 16 fans – and even from one or more air handling units when using the BACnet network interface. On a fan array, the airflow from each individual fan can be monitored to help pinpoint a failed fan in the system.
Features of the TDFi-RT include:

  • One interface supports 1 to 16 fans with 1 or 2 sensors per fan
  • Airflow measurements from 0 fpm to 10,000 fpm
  • Temperature measurements from -25ºF to 140ºF
  • Standoff mounting using cantilevered design
  • Built-in 1-, 2- or 3-point field calibration after installation to obtain spot-on installed accuracy
  • Two-line, 16-character display for easy setup, configuration and real-time airflow and temperature

The Ruskin TDFi-RT can help satisfy the requirements for minimum outside air as required by LEED (USGBC); ASHRAE 62.1, ASHRAE 90.1 and ASHRAE 189.1; California Title 24; International Mechanical Code (IMC) and the International Energy Conservation Code (IECC).
For more information about the TDFi-RT from Ruskin, visit To learn more about Ruskin, visit
Photo Caption
The TDFi-RT from Ruskin®, a unique electronic thermal dispersion-type air measurement device for fan inlets, reports both airflow and temperature in a building’s HVAC automation system.
About Ruskin
Ruskin is a worldwide leader in manufacturing air control solutions. Backed by over 60 years of expert engineering and innovation, Ruskin is widely recognized as the most specified brand for high-performance air control solutions, including dampers, louvers, energy recovery ventilators (ERV), air measurement devices and sound control for HVAC systems. Ruskin products are used in commercial applications such as data centers, high-rise buildings, retail, hotels, healthcare and education facilities. In addition, Ruskin products can be found throughout the world’s industrial applications, such as warehouses and transportation hubs. Ruskin is part of the Johnson Controls group, which includes air systems, building automation and controls, fire detection, fire suppression, HVAC equipment, industrial refrigeration, retail solutions and security. For more information about Ruskin, visit, or find the company on FacebookTwitterLinkedIn and YouTube.
About Johnson Controls
At Johnson Controls (NYSE:JCI), we transform the environments where people live, work, learn and play. As the global leader in smart, healthy and sustainable buildings, our mission is to reimagine the performance of buildings to serve people, places and the planet.
With a history of more than 135 years of innovation, Johnson Controls delivers the blueprint of the future for industries such as healthcare, schools, data centers, airports, stadiums, manufacturing and beyond through its comprehensive digital offering, OpenBlue. With a global team of 100,000 experts in more than 150 countries, Johnson Controls offers the world’s largest portfolio of building technology, software and service solutions with some of the most trusted names in the industry. For more information, visit or follow us @johnsoncontrols on Twitter.


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