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.
What Is a Space Heater? A space heater is a portable, electric-powered machine that is designed to generate heat within a single, enclosed space. There are two distinct categories of heaters that are based on how they transfer heat: convection and radiation. Convection heaters heat the air around them, which in turn transfers the heat to the surrounding area. Nowadays, more and more convection heaters utilize internal fans to help distribute the heat faster at the cost of being a bit noisier.