Modular Metal Fabricators, Inc. established in 1970, specializes in supplying high quality, competitively priced, sheet metal fittings and duct work to the heating, ventilation, air conditioning and roofing industries.  Low overhead levels and high volume production methods are used to maintain a high level of customer service. Our facility is the largest of its kind west of the Mississippi. Most standard sizes used in residential applications are stocked at the factory to keep delivery lead time to a minimum.  While this catalogue accurately represents the standard product line, MMF, Inc. has a great amount of manufacturing versatility.