# What is fan stall zone?

## What is fan stall zone?

]. Fan stall occurs as the fan reaches its stable operating range limit. This happens when the pressure rise across a fan increases to the fan’s pressure developing limit and the flow velocity though the fan reduces to the point at which it first falls to zero and then reverses.

### What is the difference between backward and forward curved fans?

The difference in flow direction between a forward and backward curved centrifugal fan is the direction that the air exits the impeller circumference. With a backward curved impeller, the air exits in a radial direction whereas with a forward curved the air exits tangentially from the circumference of the fan.

#### How do I know if my fan is stalling?

How to inspect an axial fan stall probe

1. Ensure condensation in hoses or pipes is not trapped and can flow back into the fan.
2. Inspect tubes for defects (looseness, bends, etc.)
3. Check for leakages.
4. Inspect regularly (frequency according to the IOM manual)

How do you read an axial fan performance curve?

How to Read a Fan Performance Curve

1. Horizontal Bottom Axis = Air Volume Flow Rate (SCFM or m3/sec.)
2. Vertical Left Axis = Static Pressure (inches water gauge [wg], pascals [Pa], or mm water gauge)
3. Vertical Right Axis = Brake Horsepower (BHP or KW)

Which fan is suitable for high pressure and also high flow?

Centrifugal fans
Centrifugal fans are capable of generating relatively high pressures. They are suitable for high pressure applications as compared with axial flow fans. Generally centrifugal fans have three types of blade: forward blade, backward blade and radial blade.

## Why are backward curved vanes used?

The benefit of using a backward curved motorised impeller is that it does not have a stall point on its characteristic. This means that there is no point on the fan characteristic curve that it should not be operated.

### How do you read a fan curve chart?

The first thing to note about the fan curve graph is that it has 3 axes:

1. Horizontal Bottom Axis = Air Volume Flow Rate (SCFM or m3/sec.)
2. Vertical Left Axis = Static Pressure (inches water gauge [wg], pascals [Pa], or mm water gauge)
3. Vertical Right Axis = Brake Horsepower (BHP or KW)

#### What type of fan is the most efficient?

Ceiling fans
Ceiling fans are the most efficient fan type – they move the most air per watt. Box fans are the most efficient fan type for personal cooling. In the US, on average, it costs \$0.0059 per hour to run a fan.

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