4 are properly oriented and positioned together when properly oriented such that the half shear retainers 8 in the retention frame 6 each 14 line up with a corresponding polymer hole 24 and retention hole 14 in the panel 2 the retention frame 6 and infrared transmissive polymer 4 can be positioned against panel 2 effectively sandwiching the infrared transmissive polymer 4 between retention frame 6 and panel 2 the assembly can then be secured by the use of hardware such as the retaining nuts 10 and retaining bolt 26 retaining bolt 26 can be passed through holes in panel 2 infrared transmissive polymer 4 and retention frame 6 retaining nut 10 can then be fastened onto the bolt such that the retention frame 6 is secured against panel 2 it should be appreciated that retaining bolt 26 is short enough that it does not protrude very far into the electrical panel this helps ensure that it does not come into contact with any energized electrical components with retention frame 6 securely fastened against panel 2 infrared transmissive polymer 4 is secured and is prevented from moving due to the series of half shear retainers 8 positioned around frame opening 22 the infrared transmissive polymer 4 would act as a window that infrared radiation can pass through while preventing contaminants from entering the electrical enclosure the infrared transmissive polymer 4 would also prevent a user from inadvertently contacting electrical components housed within the electrical enclosure in a preferred embodiment a cover 12 is provided that protects the transmissive infrared polymer.