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 ...
Sitting in an office, or in their own homes, many people don’t notice their building’s ductwork unless there is something wrong with it — it’s too noisy or the air in the room is too cold or too hot.
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