Data test and analysis of the Calculating charts for frictional resistance of ventilation ducts

During recompiling process, main data as steel air ducts, dust removal air ducts, airtight air ducts in the original National ventilating duct calculating chart are included after calculation and verification by tests and simplification. Meanwhile, the calculation charts for spiral ducts, hydraulic inorganic glass reinforced plastic air ducts, magnesium oxychloride cement air ducts, glassfiber air ducts, phenolic air ducts, polyurethane composite air ducts, etc are added. The error analysis shows that the absolute error of the specific frictional resistance is 0.067 Pa per meter, and the relative error is 2.54%.