a housing;

an air flow pathway extending through the housing coupled to receive intake air from the inlet and coupled to expel outtake air through the outlet;

air conditioning apparatus disposed in the airflow pathway between the inlet and the outlet conditioning an air stream passing through the air flow pathway from the inlet to the outlet;

a first framework mounted in the airflow pathway between the air conditioning apparatus and the inlet;

a second framework mounted in the airflow pathway between the first framework and the inlet;

filters carried by the first framework each for entrapping contaminants in the air stream upstream of the air conditioning apparatus, the filters cooperating forming an upstream face facing the second framework and an opposed downstream face facing the air conditioning apparatus;

downstream electrodes disposed in the air flow pathway between the air conditioning apparatus and the filters each affixed to and contacting one of the filters, the downstream electrodes electrically interconnected;

an ionizer electrode carried by the first framework in the air flow pathway between the inlet and the upstream face formed by the filters;

an upstream electrode carried by the first framework in the air flow pathway between the inlet and the ionizer electrode;

a first potential applied to the ionizer electrode imparting through induction a) a second potential to the upstream electrode forming a first ionizing field between the upstream electrode and the ionizer electrode, and b) a third potential to the downstream electrodes, the electrical interconnection between the downstream electrodes substantially uniformly dispersing the third potential across the downstream electrodes forming a substantially uniform second ionizing field between the downstream electrodes and the ionizer electrode.