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Mining & Industrial Fan Questions & Answers

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

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

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 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

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 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 formula for fan air power?

The formula for fan air power expresses how much useful power is carried by the moving air stream, before motor and mechanical losses are considered. In its simplest form, air power is the product of

Q

How to calculate CFM flow?

Knowing how to calculate CFM flow is fundamental for selecting and checking fans in industrial and mining ventilation. The most practical method is based on the relationship Q = A × V, which says that
Q

Which Is Quieter: Axial or Centrifugal Ventilation Fan?

There is no simple rule that axial fans are quieter than centrifugal fans or vice versa. Noise depends on fan size, speed, blade design, system resistance and how the fan is installed and silenced. In
Q

Is air density the same as atmospheric pressure?

Air density is not the same as atmospheric pressure, although the two are closely related. Air density is the mass of air per unit volume, usually expressed in kg/m³. Atmospheric pressure is the force
Q

What is the air pressure at 4000m?

At an elevation of around 4000 m above sea level, the atmospheric pressure is much lower than at sea level. While exact values depend on temperature and local weather, a typical estimate is in the ran
Q

What is considered a good fan curve?

A good fan curve is more than just a line on a catalogue; it is a clear picture of how a fan behaves in real ventilation systems. From a design and operations perspective, a good fan curve is one that
Q

What Causes Vibration Noise in Duct Ventilation Fans?

Vibration noise in duct ventilation fans is a sign that the fan, ductwork or supports are moving more than they should. This can be caused by mechanical problems such as imbalance and misalignment, or
Q

What is a ventilation tunnel?

A ventilation tunnel is an underground passage constructed primarily to move air rather than to carry vehicles, ore, or passengers. It is used as part of a ventilation system to supply fresh air or re
Q

How to tell if a fan is powerful?

To know whether a fan is truly powerful, you have to look beyond its physical size or motor nameplate and examine its airflow, pressure and power ratings at the duty point. A large fan that can only m
Q

How much does an air tunnel cost?

There is no single fixed price for an air tunnel, because the cost depends on many project-specific factors. When people ask how much an air tunnel or ventilation tunnel costs, they may be thinking ab
Q

How to study fan curve?

Learning how to study a fan curve is essential for anyone involved in selecting or troubleshooting ventilation fans in industrial plants and mines. A fan curve is a graphical summary of how a fan beha
Q

Why is tunnel ventilation important?

Tunnel ventilation is important because it makes enclosed road, rail, metro and mining tunnels safe and usable. Without a designed ventilation system, exhaust gases, dust, heat and smoke would quickly
Q

What is the fan curve theory?

Fan curve theory describes how a fan behaves when it is connected to a real ventilation system. Instead of having a single fixed output, every fan has a whole range of possible combinations of airflow
Q

How does an air tunnel work?

An air tunnel is an underground passage or structure built mainly to move air rather than to carry vehicles or ore. It works by providing a low-resistance path that allows pressure differences, create
Q

What does a fan curve tell you?

A fan curve is one of the most useful tools in ventilation engineering because it tells you, at a glance, how a fan will behave when installed in a real system. Instead of giving only a single rating,
Q

Which Fan Blade Shape Moves More Air in Ventilation?

The fan blade shape that moves more air most efficiently is usually an airfoil profile, but the best blade shape for a ventilation system depends on pressure, dust, noise and cost requirements. In ind
Q

Why do tunnels have exhaust fans?

Tunnels have exhaust fans because enclosed underground spaces cannot rely on natural airflow alone to keep air safe and clear. Exhaust fans are a key part of tunnel ventilation systems. They remove po
Q

Is it better to have your fan higher or lower?

Whether it is better to have your fan higher or lower depends on what you are trying to achieve with the ventilation system. Fan height and position strongly influence how air moves through a room, in
Q

What is the difference between cross ventilation and tunnel ventilation?

The difference between cross ventilation and tunnel ventilation lies in the direction of airflow and how it is generated. Cross ventilation is typically a natural or low-pressure airflow moving across
Q

How to set up proper fan curves?

Knowing how to set up proper fan curves is essential for reliable engineering of industrial and mining ventilation systems. A proper fan curve is not drawn by guesswork; it is based on tested performa
Q

How Long Does a Duct Booster Fan Usually Last?

A duct booster fan typically lasts around 5 to 10 years in normal residential or light industrial use, although actual life can be shorter or longer depending on quality, operating time and maintenanc
Q

What is a tunnel ventilation system?

A tunnel ventilation system is the complete combination of equipment and controls used to manage airflow, air quality and smoke in road, rail, metro and mining tunnels. It includes main supply and exh

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