Total heat exchanger is made of ER paper which is featured by high moisture permeability, good air tightness,
excellent tear resistance, and aging resistance. The clearance between the fibers is very small, so only the
moisture molecules of small diameter can go through, the odor molecules of larger diameter are unable to pass
through it. By this means, the temperature and humidity can be recovered smoothly, and prevent the pollutants
infiltrating to the fresh air.