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.
It is recommended when the sides of the Plenum Box are exposed and with the following conditions: 1) The make-up air is cooled, or 2) the make-up air is not heated and outside temperatures are cool.Matte faced is the standard insulation.he plenum box shall be capable of delivering up to 150 CFM per lineal ft. of ventilator at a low velocity. The plenum box shall be designed to fit in front of the ventilator, either flush with the ceiling or dropped down in front of the ventilator.