The BNM IR window range is underground mining compliant as they are 100% aluminium free and provide a facility to indirectly view and monitor electrical equipment while in operation. The windows allows transmission of infrared, visible and ultraviolet light. The assembly consist of a crystal window, stainless steel flange and sealing materials.

BNM series windows have been type tested for the following ratings 0.15-10μm, 40kA for 0.8s at 12kV, IK07 and IP68. The industrial grade windows are designed to be installed in switchgear and termination enclosures.