The international airports in Pennsylvania are Lehigh International Airport at Allentown, Erie International Airport at Erie, Harrisburg International Airport at Harrisburg, Philadelphia International Airport at Philadelphia,
Electric Plenum Heaters. A plenum heater is an electric resistance heating device that is installed in the plenum, which is the spot in the ductwork system where ducting and furnace join. Air is heated as it flows across electric elements and then is distributed through the existing ductwork.
Single strand of fiber surrounded by a 900 um buffer then a layer of Kevlar and finally the outer jacket. Available in 2mm or 3mm. Plenum or Riser Jacket. Plenum is stronger and made to chare in fire versus riser is made to melt in fire. Riser cable is more flexible.