Round Infrared Window
.Round Infrared Window, Crystal Insert Size 80mm dia, Viewing Aperture Size 73mm dia, Viewing Aperture Area 4186 sq mm, Window Thickness 2 mm, NEMA Rating 12, 3, IP Rating 65, Gasket Maximum Temperature 250 Degrees C (482 Degrees F), Body Maximum Temperature 659 Degrees C (1218 Degrees F), Optic Maximum Temperature 1400 Degrees C (2552 Degrees F), Voltage Range Unlimited, Components Cover, IR Window, Body Material Aluminum, Includes Access Key, Drilling Template, Fixing Screws 3 In.