EXN Extruded Aluminum IP66 PCB Enclosures Bud Industries EXN Extruded Aluminum IP66 PCB Enclosures combine esthetics and functionality, while providing IP66 Rated protection in a wide variety of sizes and colors. EXN Enclosures are ideal for fitted PCB And external mounting brackets, and may be used as a free-standing unit. The EXN series is available with polycarbonate or aluminum die-cast covers. and is suitable for a vast array of applications that may require an opaque, clear, IR, or very durable metallic cover.