About the Hollow Metal Manufacturers Association / NAAMM

The Hollow Metal Manufacturers Association (HMMA) is a division of the National Association of Architectural Metal Manufacturers (NAAMM). HMMA is a group composed of companies that manufacture, distribute and promote the use of hollow metal door and frame products. Its principal mission is to look outward to serve the building construction industry by creating the conditions essential for the production of high quality, high performance hollow metal products. To learn more, visit hollowmetal.org.