Diagnosing System Effect Common Causes And Where to Start

This course explores the concept of system effect and its impact on fan and air handling system performance, as presented in the AABC TAB Journal article “Diagnosing System Effect: Common Causes and Where to Start.” Participants will review how airflow restrictions, improper duct configurations, and installation deficiencies at fan inlets and outlets can reduce system performance and distort fan curves. The presentation outlines practical diagnostic steps used by independent TAB professionals to identify system effect conditions in the field. Attendees will also learn where to begin troubleshooting, how to distinguish system effect from equipment deficiencies, and why proper installation and verification are critical to achieving design intent airflow and pressure performance.

Learning Objectives

1. Define system effect and explain how adverse inlet and outlet conditions impact fan performance, airflow, and static pressure.
2. Identify common causes of system effect, including improper duct connections, obstructions, poor fan orientation, and installation errors.
3. Recognize field indicators of system effect by interpreting fan performance data, airflow measurements, and observed system behavior.
4. Apply a structured diagnostic approach to determine where to start troubleshooting system effect issues and how TAB findings support corrective action and design intent compliance.

Sponsored By: Evergreen Telemetry

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