Series FSA

PROTHERM, LLC™ Series FSA heaters are highly efficient, fast response, medium wavelength, electric infrared heaters with air flow designed for use in general industrial process heating and drying applications for sensitive products such as coatings on webs or textiles.

Airflow is directed through holes between heating elements to help break up vapor barriers from evaporating moisture.  This increases the infrared drying efficiency and can help quickly cool the heater and product upon a line stop.  The air supply can be provided from a variety of sources that is appropriate for the application.


  • Operates at element temperatures up to 2100 f (2.0 micron-peak).
  • Designs up to 50 watts per square inch.
  • Unique serpentine metallic elements.
  • Perforated face for air impingement.
  • Highly efficient and effective.
  • Efficiencies exceeding 89% have been proven, the highest in the industry.
  • Heats up to processing temperatures in about 30 seconds.
  • Cools down to “safe” temperatures in 30 seconds or less.
  • Operating life in excess of 10,000 hours is expected when operated at 80% of rated output.
  • Can be mounted horizontally or vertically without element sag.
  • Self-cleaning, maintenance free.
  • Resistive load can be precisely controlled.
  • Completely field survivable.
  • Heats all colors uniformly.

Standard Features

  • Aluminized steel case
  • Stainless steel protective face screen
  • Mounting studs
  • 6″ lead wires in a 2×4 or 4×4 junction box
  • Dimensions (custom sized)
    Maximum width = 18″
    Maximum length = 16′
    (Standard length is heated length + 3″)
    Thickness = 5″ plus air fittings, ducts or blowers
    (including protective face screen)

Optional Features

  • Stainless steel case
  • Built in type “K” thermocouple
  • Long lead wires
  • Special conduit fittings
  • Flexible metallic conduit
  • Air input fans, blower, or ducts
  • Special mounting devices or locations
  • Multiple zones


PROTHERM can build exact replacements for discontinued DRI brand radiant air dryers. Call for more information.