According to a study conducted by Lawrence Berkeley National Laboratory for the Department of Energy (DOE), duct leakage is the leading cause of energy inefficiencies in commercial buildings. On average, duct leakage wastes 28.6 billion kw-hrs of electricity per year and costs U.S. building owners nearly $3 billion annually. These startling statistics make it imperative that duct systems move air to every VAV box quietly and efficiently to reduce energy consumption and leakage rates.
One of the best ways to reduce duct leakage and improve energy efficiency in VAV systems is to move from rectangular ductwork to spiral round — sometimes referred to as spiral — ductwork. In addition, ASHRAE guidelines continue to drive the industry towards spiral round ductwork because: