1. Sheet Metal and Air-Conditioning Contractors' National Association. 1983.HVAC Systems—Testing, Adjusting and Balancing, 7–1. 7–5. Vienna, VA: Sheet Metal and Air Conditioning Contractor's National Association, Inc.
2. American Conference of Governmental Industrial Hygienists. Industrial Ventilation—A Manual of Recommended Practice, 21st ed. ACGIH. Cincinnatl, OH Chapter 5
3. Idelchik, I. E. 1986.Handbook of Hydraulic Resistance, 2nd ed., 344–354. New York, NY: Hemisphere Publishing Corp.
4. Friction Tables Determined from Colebrook's Equation for Standard Density Air Flow