Spectrex 40/40I Triple IR (IR3) Flame Detector - Manual (Page 22)

SharpEye TM IR3 Flame Detector User Guide
10 Performance Considerations
1.5.2 Cone of Vision
 Horizontal: 100°
Figure 1: Horizontal Field of View
 Vertical: +50° (down) , -45° (up)
Figure 2: Vertical Field of View