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The High-Output DEF (Double Ended Fixture) ultraviolet lamp series from UV Resources can be easily installed in most any HVAC system to destroy coil/drain pan microbial infestations and disinfect moving air streams. The series is designed to provide up to twice the ultraviolet irradiation to kill and/or degrade microorganisms and organic matter, whether surface or airborne, in challenging applications at up to half the cost of similar products, said company officials. The lamps feature a 120-277V waterproof ballast design, stainless steel construction and built-in weep holes to withstand harsh commercial or industrial HVAC environments.