Infrared Window Crystal Insert Size 95mm dia Viewing Aperture Size 89mm dia Viewing Aperture Area 6221 sq mm Window Thickness 4mm NEMA Rating 12 4 IP Rating 67 Gasket Maximum Temperature 76.7 Degrees C (170 Degrees F) Body Maximum Temperature 510 Degrees C (950 Degrees F) Optic Maximum Temperature 1355.6 Degrees C (2474 Degrees F) Voltage Range Any Components Stainless Steel Frame and Cover Body Material Stainless Steel Includes Installation Instructions