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Fans, blowers and compressors are differentiated by the method used to move the air, and by the system pressure they must operate against. As per American Society of Mechanical Engineers (ASME) the specific ratio - the ratio of the discharge pressure over the suction pressure is used for defining the fans, blowers and compressors.

Equipment /Specific Ratio /Pressure rise (mmWg)

Fans /Up to 1.11 /1136

Blowers /1.11 to 1.20 /1136 2066

Compressors /more than 1.20 /

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What is the purpose of the blower in a fan?

The blower in a fan is responsible for generating airflow by pulling or pushing air through the fan. It helps to circulate air in a room, cool equipment, or exhaust stale air. The blower creates the pressure difference needed to move air efficiently.


What's the difference between blower and fan?

A blower is typically designed to move air at a higher pressure than a fan, making it more suitable for applications such as blowing debris or inflating objects. A fan, on the other hand, is designed to move air at a lower pressure and is commonly used for cooling or ventilation purposes.


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A fan blower is used to create air flow by pushing air in a specific direction, commonly used for ventilation or cooling purposes. A compressor, on the other hand, is used to increase the pressure of a gas or air by reducing its volume, often found in refrigeration systems or air conditioning units to compress coolant gases. In summary, a fan blower moves air, while a compressor pressurizes air.


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When Does it matter if a gas heater fan blower is wired reverse polarity?

It matters if the gas heater fan blower is wired with reverse polarity because it can cause the motor to run in the wrong direction, resulting in inefficient air circulation or overheating. This can also potentially lead to damage to the motor or the electrical components of the heater. It is important to have the blower wired correctly to ensure the proper functioning and safety of the gas heater.

Related Questions

What is the purpose of the blower in a fan?

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How do you replace a fan blower resistor on a vauxal Corsa?


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