2017 IIAR Natural Refrigeration Conference and Heavy Equipment Expo Recap Attendees of the IIAR Natural Refrigeration Conference and Expo come from all facets of the industry including design engineers, contractors, end users, academics, scientists, trainers, and government agencies. We reached a wide and diverse audience of ammonia and natural refrigeration professionals. With exposure to a variety of point of views, attendees became aware of new ideas and trends that impact the future of the natural refrigeration industry.