The Brazed Aluminum Plate-Fin Heat Exchanger Manufacturers' Association (ALPEMA) represents the world's five major manufacturers of brazed aluminum plate-fin heat exchangers (BAHXs). These are very compact exchangers built to a high specification for use in air separation plants and a wide range of other petrochemical and refrigeration applications. The Association has developed a set of standards for the manufacture, installation and safe operation of BAHXs.