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Mining & Industrial Fan Questions & Answers

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

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 ventilation requirements for underground mining?

The ventilation requirements for underground mining are defined by a combination of laws, regulations, industry standards, and company rules that together specify how much air must be supplied, how cl
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 natural ventilation in underground mines?

Natural ventilation in underground mines is the airflow that occurs without mechanical fans, driven only by differences in temperature, pressure and wind between surface openings. Before large electri
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

What are the ventilation devices in mining?

Ventilation devices in mining are the components used to move, direct, and control air underground. Together, they form the mine’s ventilation system, ensuring that fresh air reaches every working pla
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

Intake vs exhaust fans in mine ventilation: what’s the difference?

In mine ventilation, intake fans and exhaust fans describe how main ventilation fans are arranged relative to the mine airways and what direction they move air. The difference between them is fundamen
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 confirm airflow direction: intake or exhaust in mine ventilation ducts?

To confirm airflow direction in mine ventilation ducts—whether they are working as intake or exhaust—the safest approach is to combine simple visual checks with basic instruments. This is important be
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

Why use a centrifugal fan?

A centrifugal fan is used when a ventilation or process system needs higher static pressure, stable airflow and robust performance in demanding conditions. Unlike axial fans, which are optimised for h
Q

What is a mine vent?

A mine vent is any opening, structure, or device in a mining operation that is used primarily for moving air into or out of the underground workings. While people often use the term informally, in pra
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

What is the history of mine ventilation?

The history of mine ventilation is closely tied to the history of underground mining itself. As soon as people began working below the surface, they faced problems with foul air, smoke, and heat. Earl
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,

Q

What are the disadvantages of using a fan?

Fans are simple and economical ventilation devices, but they do have disadvantages and limitations that need to be understood when designing industrial or mining systems. Recognising these drawbacks h
Q

What is primary ventilation in mining?

Primary ventilation in mining is the main ventilation system that moves air through the entire underground mine. It consists of large mine ventilation fans, major intake and return airways, and the ov
Q

How to calculate fan requirements?

Knowing how to calculate fan requirements is essential for designing reliable ventilation in industrial plants and mines. Instead of starting from a catalogue, you begin by defining what the fan must

Q

What is the difference between centrifugal and axial blower?

The difference between a centrifugal blower and an axial blower lies in how they move air, the pressure they can generate and where they are used. Both are types of fans, but their internal geometry i
Q

What is mechanical ventilation in mining?

Mechanical ventilation in mining is the use of fans and engineered airways to move air through an underground mine in a controlled way. Instead of relying on natural pressure differences caused by win
Q

What is CFM in fan airflow?

CFM in fan airflow stands for cubic feet per minute, a unit that describes the volume of air a fan moves per minute. It does not measure pressure or speed directly; instead, it tells you how much air

Q

What is the central ventilation system in mining?

A central ventilation system in mining is a mine-wide arrangement in which most or all of the required airflow is generated and controlled from one or a few main fan stations, rather than relying on m

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