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Plain language, practical explanations you can use on the job, covering static pressure, velocity pressure, total pressure, dynamic loss and friction losses. Learn how duct sizes and fittings affect airflow. Easy-to-use equations. Understand how airflow works. Your job is to deliver air. But do you really understand your delivery system? Learn what happens in the duct. Understand static pressure, velocity pressure, total pressure, dynamic loss, and friction losses—in practical terms that you can use on the job. Learn how duct fittings affect airflow. This book gives you another step to HVAC success. You will gain an understanding of airflow that few in the industry have.