The DLX-N high output, dual lamp ultraviolet (UV) NEMA-4 fixture disinfects HVAC/R airstreams, cooling coils and drain pans, halting infectious diseases, such as the SARS-CoV-2 virus. UV lamps are inserted inside the duct spear-style through two 3/4-inch holes, while the fixture is installed and serviced from an exterior supply, return or exhaust plenums or ducts. The new UV-C fixture offers a versatile means of inactivating airborne pathogens on almost any inside or outside duct.