Refrigeration & Air Conditioning Mechanic Red Seal · Question
When assessing a duct system's performance, measuring the total static pressure rise across a supply fan provides crucial information. Which of the following conditions would typically lead to a higher-than-design total static pressure rise for a given airflow, assuming the fan speed remains constant?
Sharp elbows and abrupt transitions create significant turbulence and friction, dramatically increasing the pressure losses in the duct system. This increased r
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Question: When assessing a duct system's performance, measuring the total static pressure rise across a supply fan provides crucial information. Which of the following conditions would typically lead to a higher-than-design total static pressure rise for a given airflow, assuming the fan speed remains constant?
Answer options:
- Reduced duct length in the supply side distribution
- Removal of an existing MERV 8 filter and replacing it with a MERV 4 filter ✅ Numerous sharp elbows and abrupt transitions in the supply ductwork
- Opening more supply registers, thus decreasing system resistance
Correct answer: Numerous sharp elbows and abrupt transitions in the supply ductwork
Explanation: Sharp elbows and abrupt transitions create significant turbulence and friction, dramatically increasing the pressure losses in the duct system. This increased resistance requires the fan to overcome a higher total static pressure to deliver a given airflow.
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