The NBB-22245 is a Plastic Box with light grey ABS (acrylonitrile butadiene styrene) body. Clear doors, for all models are molded out of polycarbonate material with UL94V0 flammability rating. Designed to IP66 of IEC 529 and NEMA-1, 4 and 4x specifications. A large size vent is also available (IPV) and can be mounted with or without a cooling fan.