Discuss:What are the pros/cons of reducing duct size for the same airflow? What are the pros/cons of increasing duct size for the same airflow? Discuss: What is a riser, what is the purpose of a riser? Perform Construct a single line duct layout and preliminary duct sizes for all supply, outside air and exhaust systems, indicating duct size and flow rate on level 1. Section 2 –Duct Analysis, System Selection and Sustainability (1) - Pressure loss calculations and fan selection (Ventilated spaces only) Discuss: In terms of duct pressure loss calculations what is an index run (equal friction method)?