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Mining & Industrial Fan Questions & Answers

Q&A on mining and industrial fans – types and application scenarios.

Q

Which is better, a 1200mm or a 1400mm fan?

Neither a 1200 mm fan nor a 1400 mm fan is automatically better; the right size depends on the space, the required airflow and how the fan will be operated. In general, a larger-diameter fan (1400 mm)
Q

What are the rules for cross ventilation?

Cross ventilation means allowing air to flow across a space from one side to the other, usually by using openings on opposite walls or faces of a building or tunnel. To make cross ventilation effectiv
Q

What is the difference between axial fan and blower fan?

The main difference between an axial fan and a blower fan is how they move air and the static pressure they can generate. In most industrial and mining contexts, a “blower fan” refers to a centrifugal
Q

What are tunnel fans for?

Tunnel fans are specialized ventilation fans used to move air through road, rail, metro, and mining tunnels. Their main purpose is to control exhaust gases, dust, temperature, and smoke so that people
Q

What does cross ventilation look like?

Cross ventilation is easiest to understand if you picture how the air actually moves through a room or tunnel. In a well-designed cross-ventilated space, you can imagine—or sometimes see—air entering

Q

What are the real life applications of axial fans?

Axial fans are used in a wide range of real-life applications wherever large volumes of air must be moved at relatively low pressure. Their simple, propeller-like design and in-line airflow make them

Q

How to ventilate a tunnel?

Ventilating a tunnel means designing and operating a system that moves air through the tunnel in a controlled way so that exhaust gases, dust, heat, and smoke are kept within safe limits. The exact so
Q

What is an example of cross ventilation?

A simple and clear example of cross ventilation is a room with one window on the east wall and another on the west wall. When both windows are open and there is a breeze outside, air enters through th
Q

What is an axial flow fan?

An axial flow fan is a ventilation fan that moves air parallel to the fan shaft, like a propeller. Air enters the fan from one side and leaves from the other in the same direction. Because of this str
Q

What is natural ventilation for tunnels?

Natural ventilation for tunnels is the movement of air through a tunnel without the use of mechanical ventilation fans. Instead, airflow is driven by environmental factors such as wind at the portals,
Q

What is ventilation?

Ventilation is the process of supplying fresh air to a space and removing stale or contaminated air. It can occur naturally through openings such as windows and vents, or it can be provided mechanical
Q

What is the difference between axial flow fan and centrifugal fan?

The main difference between an axial flow fan and a centrifugal fan is the direction of airflow and the amount of static pressure each can generate. Axial flow fans move air parallel to the shaft, lik
Q

What is a tunnel damper?

A tunnel damper is a movable plate or set of blades installed in tunnel ventilation ducts, shafts, or wall openings. Its main function is to open, close, or modulate the passage of air so that enginee
Q

What are the risks of poor ventilation?

Poor ventilation carries a wide range of risks for people, equipment and buildings. When there is not enough fresh air or the airflow is badly organised, contaminants and heat can build up, leading to
Q

What is the difference between an axial and radial fan?

The difference between an axial fan and a radial fan lies in the direction of airflow and the pressure capability. Axial fans move air parallel to the shaft, while radial fans (a form of centrifugal f
Q

What is a ventilation shaft for a tunnel?

A ventilation shaft for a tunnel is a vertical or steeply inclined opening that connects the tunnel to the surface and is used mainly for moving air rather than vehicles or people. It forms an essenti
Q

How much does a ventilation system cost to run?

The cost to run a ventilation system varies widely, but it is mainly driven by fan power, operating hours and electricity price. In a small building with a few modest fans, the running cost may be rel
Q

What is the difference between axial and radial blowers?

The difference between axial and radial blowers is mainly the direction of airflow and the type of duty they are designed for. Axial blowers move air parallel to the shaft like a fan, while radial blo
Q

What are the disadvantages of a ventilation system?

While a well-designed ventilation system is essential for safety and comfort, it also has several disadvantages and drawbacks that building owners, industrial operators and mine managers must consider
Q

What is the definition of axial flow?

Axial flow is defined as fluid flow that moves predominantly parallel to the axis of rotation or the main axis of a machine. In ventilation and turbomachinery, this means that air enters and leaves th
Q

How does air density affect fan performance?

Air density has a direct and significant effect on fan performance. When we talk about fan curves and duty points for industrial or mining ventilation fans, the published data is almost always based o
Q

Which is better cross flow fan or centrifugal fan?

Neither a cross flow fan nor a centrifugal fan is universally better; each is better for specific applications. Cross flow fans are compact devices that produce a wide, uniform air stream at low press
Q

How to evaluate fan performance?

Evaluating fan performance means checking whether a fan installed in a mine or industrial plant is delivering the airflow and pressure you expect, and doing so efficiently. Proper evaluation requires

Q

What is an axial fan?

An axial fan is a type of ventilation fan that moves air parallel to the fan shaft, in a straight-through path from inlet to outlet. The impeller looks similar to a propeller, and as it rotates it dra
Q

How much does air pressure drop per 1000 feet?

When people ask how much air pressure drops per 1000 feet, they are usually talking about atmospheric pressure and altitude, not the friction loss in a duct. As you go higher above sea level, the weig
Q

What is the difference between an axial fan and a centrifugal fan?

The main difference between an axial fan and a centrifugal fan is the direction of airflow through the impeller and the pressure each type can develop. Axial fans move air parallel to the shaft in a s
Q

How to calculate the air flow of a fan?

There are two main ways to calculate the airflow of a fan in an industrial plant or mine: by direct measurement of velocity and area, and by using fan curves together with system pressure measurements
Q

How is fan air flow measured?

Fan airflow is measured by determining how fast air is moving through a known area and then converting that information into a volume flow rate. In industrial ventilation and mine air surveys, this is
Q

Is an inline fan an axial fan?

An inline fan is not automatically an axial fan. The term “inline” describes how the fan is installed in a duct system, not the exact impeller type inside. An inline fan is designed so that ducts conn
Q

What are typical CFM values for fans?

When people ask about typical CFM values for fans, they want to know what airflow ranges are common for different sizes and applications. CFM (cubic feet per minute) is a measure of volume flow rate,

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