What could cause vibration in a large air-handler fan

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Reference no: EM131375895

1. Why are direct digital control (DDC) systems sometimes referred to as energy-management systems?

2. What could cause vibration in a large air-handler fan?

3. What do vibration monitors specifically measure?

4. What types of control valves are used for heating and cooling coils?

Reference no: EM131375895

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