Ultraviolet Germicidal Air Sterilizer & Air Purifier ballast box attached to air duct system.

UV Germicidal bulb penetrates air duct system for direct contact with all air moving through the air duct system.

Furnace cross-section showing an Ultraviolet Germicidal
Air Sterilizer & Air Purifier installed either in the air duct system or in the furnace/coil area.

UV Germicidal Bulb US Patent #4,200,101