America's BEST source for UL Listed NFPA 496 Type Y & Z Enclosure Purging & Pressurization Systems! These Systems protect electrical and electronic devices within sealed, NEAM 4 or NEMA 12 enclosures in Class I & II Hazardous Classified Locations. By pressurizing and purging the enclosures using instrument grade compressed air, these systems create a safe, cool and clean environment. This process protects electrical and electronic equipment within sealed enclosures and eliminates the need for explosion proof enclosures!