ARLINGTON, Va. - The Air Conditioning Contractors of America (ACCA) has released a new edition of its computer video training package, “Understanding Manual D.” According to ACCA, the five CD training package explains airflow and duct design principles in plain English, using real world examples to help in applying proper design principles for residential duct systems.

This revised version incorporates new elements from the 2009 5th edition of Manual D. Understanding Manual D now covers such additional concepts as installation of flexible duct, with emphasis on the negative effects of sag and compression, and duct system efficiency in regard to duct shape and material.

Understanding Manual D is split into five parts, allowing the user to stop and start at his own pace, and each disc includes appropriate handouts for easy printing and review. The program is taught by noted industry trainer Jack Rise.

Used by contractors, schools, utilities, and distributors, the new edition of Understanding Manual D is now available for purchase online at www.acca.org/hvacessentials/ or by calling 888-290-2220.

Publication date: 07/06/2009