The stationary duct heater is used to dry the air that enters the cargo bay optical smoke detector system aboard commercial aircraft to prevent condensation near the optical lenses of the smoke detectors.

Selected Performance Characteristics:
Heater Resistance330.6 5%
Operating Current.41 amperes maximum
Element Temperature160 8F
Thermostat Differential30 8F
Ambient Humidity0% to 100% relative humidity
Dielectric Strength500 VAC, minimum, for 1 minute
Insulation Resistance>100 megohms @ 500 VDC
Reliability 30,000 hours
Fluid Tolerance Continuous, Water
Vibration 13.5 g's, RMS
Electrical Bonding10 milliohms maximum