C Range Infrared Window With Kwik Twist, Size: 3 In, Viewing Aperture Diameter: 68 MM, Viewing Aperture Area: 3632 SQ-MM, Thickness: 2 MM, Maximum Temperature: Gaskets: 250 Deg C, Body: 659 Deg C, Optic: 1400 Deg C, Finish: Clirvu Coating, Nema Rating: Type 3/12, Enclosure: IP65, Pull-Out Strength: Up to 1388 LB, Ul Listed, Csa Certified, Ansi C37.20.7, Eemacs 14-1, IEC 62271, IEC60068-2-6, IEC60068-2-3, For Outdoor and Indoor