الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Airflow problems have plagued the HVAC industry for years. No matter how much money you spend on a high-quality HVAC system, the equipment will not work at its best without properly design and installed ductwork. Ducts that are not well designed result in discomfort, high energy costs, bad air quality, and increased noise levels. A well-designed ductwork system should deliver maximum interior comfort at the lowest operating cost while also preserving indoor air quality. The chief requirements of an air conditioning duct system is: It should convey specified rates of airflow to prescribed locations, it should be economical in combined initial cost, fan-operating cost and cost of building space, and it should not transmit or generate objectionable noise. Larger ducts require a larger initial investment, but result in lower fan energy costs over the life of the system. Other issues include space restrictions, noise level, capacity for expansion, appearance, etc.