The replaceable IR-transmissive window contructed from calcium flouride is used to help protect the lens from dirt and damage in harsh applications.
| Model | Description |
| IR-CA-PWC | Protective window for use with the PyroCube series S, G, P, and MB |
| IR-CA-PWCF | Protective window for use with the PyroCube series F and XSB |
| IR-CA-PWCB | Protective window for use with the PyroCube series F and XSB |