Infrared Window Crystal Insert Size 50mm dia Viewing Aperture Size 45mm dia Viewing Aperture Area 1590 sq mm Window Thickness 2.03 mm NEMA Rating 12 4 IP Rating 65 Gasket Maximum Temperature 200 Degrees C (392 Degrees F) Body Maximum Temperature 200 Degrees C (302 Degrees F) Optic Maximum Temperature 1200 Degrees C (2192 Degrees F) Voltage Range Unlimited Components Aperture Cover Frame Gasket Body Material Aluminum Includes Access Key Drilling Template Fixing Screws