3 In. Round Infrared Window, Optic Maximum Temperature 2,552 Degrees F, Viewing Aperture Area 5.6 sq in, Viewing Aperture Diameter 2.9 in, Viewing Aperture Height Not Applicable, Viewing Aperture Width Not Applicable, Window Thickness 0.08 in, Body Maximum Temperature 1,218 Degrees F, Includes (4) Fixing Screws, Access Key, Drilling Template, IP Rating IP65, Gasket Maximum Temperature 482 Degrees F, Crystal Insert Diameter 3.2 in, Crystal Insert Height Not Applicable Intelligent inspection window provides protected access to help comply with NFPA 70E safety standards. Embedded RFID tag and barcode communicate with CorDEX CONNECT(TM)-enabled devices and smartphones to automatically correct for transmission loss. ⢠Broadband crystal operates with any visual, IR, or ultraviolet camera⢠Vi.