DLX-N Germicidal Fixture from UV Resources is a high-output, dual-lamp ultraviolet NEMA-4 fixture that disinfects HVAC-refrigeration  airstreams, cooling coils, and drain pans. UV lamps are inserted inside the air duct through two 3/4-inch holes, while the fixture is installed and serviced from an exterior supply, return or exhaust plenum, or duct.