In 1948, research by R.G. Huebscher established flow resistance for different shapes of ductwork at equal velocities, which allowed the creation of the duct-sizing calculator or “Ductulator” for ...
PAY ATTENTION: Flexible duct must be properly installed to perform as intended. Attention to detail will make or break the duct system. July 2, 2018 In order to understand the foundational principles ...
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