Infrared Window Crystal Insert Size 206mm H x 305mm W Viewing Aperture Size 5 in H x 9-5/16 in W Viewing Aperture Area 29 972 sq mm Window Thickness 3 mm NEMA Rating 6 IP Rating 67 Gasket Maximum Temperature 273 Degrees C (523 Degrees F) Body Maximum Temperature 273 Degrees C (523 Degrees F) Optic Maximum Temperature 325 Degrees C (617 Degrees F) Voltage Range Any Components Stainless Steel Frame and Cover Body Material Stainless Steel Includes Installation Instructions