WeatherMaxâ„¢ grille for breaking up driving rain and for especially difficult environments. Highly zinc-plated, finished in durable WeatherMaxâ„¢ multi-layer foam and tight-weave mesh vapor barrier backing. IP-44 per IEC529 (IP-55 when installed with the optional MTC-23WMG-1 WeatherMaxâ„¢ grille and either MTC-PC2 or MTC-PC3 panel cover.)