The oldest parent section in a subsystem, usually the duct section connected to the fan or outside air. .... SMACNA. 1985. HVAC air duct leakage manual. Sheet Metal and Air Conditioning Contractorsa#39; National Association, Merrifield, VA.
|Title||:||1989 ASHRAE handbook|
|Author||:||American Society of Heating, Refrigerating and Air-Conditioning Engineers|
|Publisher||:||American Society of Heating Refrigerating and Air-Conditioning Engineers - 1989|