Refrigeration & Air Conditioning Mechanic Red Seal · Question
When performing a commissioning check on a new commercial ventilation system, a technician uses a balometer (air capture hood) to measure airflow at a supply diffuser. The measured flow is significantly lower than the design specification. Which of the following is the most probable immediate cause?
A heavily loaded or dirty filter bank increases the static pressure drop across the filter, which reduces the effective airflow delivered by the fan. This is a
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Question: When performing a commissioning check on a new commercial ventilation system, a technician uses a balometer (air capture hood) to measure airflow at a supply diffuser. The measured flow is significantly lower than the design specification. Which of the following is the most probable immediate cause?
Answer options:
- The fan motor has seized due to overheating
- The supply ductwork is undersized for the required airflow volume
- The outdoor air intake damper is stuck fully open, causing excessive outside air infiltration ✅ The filter bank upstream of the fan is heavily loaded with accumulated dirt
Correct answer: The filter bank upstream of the fan is heavily loaded with accumulated dirt
Explanation: A heavily loaded or dirty filter bank increases the static pressure drop across the filter, which reduces the effective airflow delivered by the fan. This is a common and direct cause of reduced airflow.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
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