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The Facilities, Mechanical, Electrical Resource Center


July 2, 2003
Editor: Thomas Yoon

Publisher: Facworld Ezine


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Publisher's Note 

Hi there,

Air filters have modest, yet important roles to play in an air
conditioning system. The effects of poor air filtration can be
widespread and extensive. Most people do not realize their 
importance because these effects happen so gradually. Without 
filters, the cooling coils of Air Handling Units get choked up, 
and the ducting collect dusts.

Filtration occurs anytime the air carrying suspended matter 
flows through a strainer of some sort.

All commercial air filters are statistical filters. This means, 
that they are built to collect a certain particle size, but 
they cannot collect all particles. They are not 100% perfect 

Two types of filters used in air filtration are mechanical 
filters and electronic air cleaners. Mechanical filters are 
divided into two types: Impingement and Dry Media types.

Impingement filters trap particles in tiny zigzag channels that 
force the air-stream to change directions frequently as it 
passes through the media. Because of their inertia, the heavier 
particles colliding with the media stick there. These zigzag 
channels could be tiny baffles that are stamped or expanded in 
a material, or could be layers of spun glass fiber, matted 
together in a random fashion.

Impingement filters are generally high velocity filters. The 
velocity of the air moving through the filtering media will 
range from 250 to 650 fpm.

Viscous impingement filters are panel filters with a viscous 
coating on the media to capture particles. Usually the coating 
is an odorless mineral oil. Viscous impingement filters are 
designed to trap fairly large dust particles. For air 
conditioning systems, these throwaway filters consist of 
fiberglass, cellulose fiber, or animal hair mat mounted on 
inexpensive cardboard frames.

Dry Media Filters lack the tacky coating that viscous 
impingement filters have. Dry media filters remove particles 
largely by interception and straining. 

Interception means to filter out the particles using the 
natural forces of attraction between molecules. Straining means 
to remove the particles that are too large to pass through the 
openings between the fibers. 

The media material can be almost any densely packed fiber, 
ranging from felt or cotton to synthetics and porous paper. 
These are made into tightly pleated fiber mats.

Dry media filters are made as plain panel, extended surface and 
automatic roll types. All these plain panel filters are 
throwaway. Extended surface dry media filters are made pleated, 
or as bags. 

Super interception extended surface filters called HEPA (High 
Efficiency Particulate Air) filters are used when there is a 
need for very clean air conditioning environment.

Folks, be cool and clean!

Until next time…

Thomas Yoon
Editor, Facworld Ezine
More information can be obtained at


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Although we do make an effort to verify offers, we do not 
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Contact Information 

Thomas Yoon, Publisher/Editor
4186 Bagan Luar Road
12000 Butterworth

Contact me at

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