Honeywell DUAL TEC DT8360ACM-SN Installation Instructions Manual page 5

8. Coverage Pattern Masking (DT8300-CPM)
A set of 60° masks are provided for masking undesired areas. Attach the masks on the outside of the detector.
With the supplied masks, you can mask 60°, 120°, 180° or 240°. Refer to the following examples:
Note: To mask a certain area, attach the mask on the opposite side of the sensor, referring to the following examples.
- 5 -