These enclosures include a UV light with timer so that interior surfaces may be decontaminated and trace DNA denatured during periods of non-use. The user may select from eight time settings. The UV light automatically shuts off when time expires, signally the enclosure is ready for the next experiment. Because these enclosures do not provide protection to the user, they should not be used in conjunction with biohazardous material, toxins or radionuclides. You and your safety officer must carefully assess the risk associated with any operation performed in a Purifier Non-Ventilated PCR Enclosure.