Plasma Air 7000 Series needlepoint ion generators are quad outlet (7400) commercial quality units intended for installation in air handling units (AHU), furnaces, or duct systems for commercial and residential applications. This ionization equipment is effective in reducing harmful pollutants and odors by introducing positive and negative ions into the system airflow. The number of units and the quantity of the ionization outlets are dependent on the airflow in the system and the severity of the indoor air pollution problem.