ID, FD, PA, And SA Fans Usage In Manufacturing
                     ID, FD, PA, And SA Fans Usage In 
Manufacturing
Jenny Knight
Writes for 
Small and Medium Business Corner & 
SMB Corner
Basically, the industrial blowers are installed to enable a flow of huge 
volume of air/gas towards various systems. That is a key element of many 
manufacturing processes. These are the most important of the blowers 
used in manufacturing:
• Induced draft (ID) fans
• Forced draft (FD) fans
• Primary air (PA) fans
• Secondary air (SA) fans
The following points will give a clear idea about the significance of these 
fans in the manufacturing sector.
• The varied kinds of industrial fans greatly contribute to the smooth 
completion of processes like handling of materials, combustion and air 
conditioning.
• Both the ID and FD fans, which are categorized under the “centrifugal 
fans,” are extensively used in industries such as chemical, metals, power 
generation and glass.
• Generally, the induced draft and forced draft fans are curved in the 
backward direction. Due to this, the fans are extremely pivotal for 
applications where high levels of pressure are involved.
• The ID and FD fans are one of the most crucial elements of any thermal 
power plant. The ID fans collect the hot flue gases that are there within the 
system and direct them into the outside atmosphere. Bringing in the air 
present in the external environment inside the system is an important 
operation of a thermal plant, as well. And, the FD fans are used for this very 
purpose.
• The basic purpose of the ID and FD fans is different. Yet; both these 
blowers ensure that the air within the system remains balanced at all times. 
Likewise, they make sure that the efficiency of the process of combustion 
gets enhanced.
• In a thermal power plant, it is very essential that the coal that has been 
pulverized is properly transported to the furnace. This objective is achieved 
with the presence of the PA fans. The primary air fans generate enormous 
pressure necessary to thrust the pulverized coal into the furnace. These 
fans operate in such a way that temperature inside the furnace is 
constantly maintained at a specified level. The temperature fluctuations are 
avoided.
• The SA fans are installed to facilitate a rise in the amount of air flow, 
whenever the situation demands. There are few instances where the air 
provided by the primary fan just falls short of completing the process of 
combustion. It is at this point that the secondary air fans come into play. 
The SA fans supply the extra air, which ensures that the combustion 
process gets completed, without any hassles.
• Though the functions of the above four types of fans are different, there 
are still few things that are common in each of them. These blowers make 
certain that working ambience is always safe; the staff has no issues in 
working for extended durations.
The fans quickly remove all the noxious fumes and pollutants from inside 
the plant and hence safeguard the health of workers. In the same way, 
when these blowers are there, the quantity of the power consumed by the 
manufacturing unit is under control. The goal of energy efficiency can easily 
be realized.
Every manufacturing unit is entailed to first be very clear about its precise 
needs. It is only then that the most appropriate types of industrial fans can 
be selected. Installing the wrong varieties of fans only creates more 
problems for the manufacturer. That is something that no one wants!
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