Most homes are full of pollutants that can't escape.  They are locked inside and people breathe and suffer from them.

The Environmental Protection Agency has found that the air in your home is always two to five times more polluted than the worst outdoor air.

Your furnace provides a perfect environment for the growth of bioaerosols (fungi, bacteria, mold spores and viruses), toxins and gases.  Because this is the collection point for most of the recirculated air in your home, it is the best place to install an ultraviolet germicidal light.

Generalaire UV Air Purifiers:

The plasma is produced by its 5 inch pure quartz broad spectrum ultraviolet lamp. The lamp output is controlled by the patented Oxy-Regulator lamp-in-tube design. The Oxy-Regulator allows you to set the intensity level of oxidation (ozone) to breakdown airborne gaseous contaminants and eliminate unwanted odors in your home.