In order to give contractors solid information on what needs to happen for a satisfactory flex duct installation, the Air Diffusion Council (ADC, the trade association of flex duct manufacturers), has published easy-to-understand guidelines. This helpful guide is aimed at contractors and technicians who are eager to demonstrate good workmanship practices and do the job right the first time.
The fourth edition of Flexible Duct Performance & Installation Standards - also known as the "Green Book" - contains helpful graphics and guidelines to maximize the benefits of flex duct when installing it either as a duct component of an air distribution system, or as the complete air distribution duct system itself.