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Facworld Ezine 57 Frequency of Filter Change   Message List  
Reply | Forward Message #65 of 70 |

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FACWORLD EZINE
The Facilities, Mechanical, Electrical Resource Center

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September 4, 2006
Editor: Thomas Yoon

contact: http://www.free-marine.com/emailform.htm
Publisher: Facworld Ezine


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Hi there,



How to Know when to Change Air-Conditioning Filters?


Although we don't usually realize it, we can actually reduce
the running cost of a building by removing the dust from the
atmosphere. The furniture, walls and fittings are preserved
longer. It also improves the health of the occupants.

Removing dust is usually done by installing filters in the
incoming air stream or the circulating air stream. In
air-conditioning systems, these filters are installed at the
air handling units or AHU's.

How do we know when to replace the filters?

As more and more dust accumulates at the filters, the
differential pressures between the inlet and the outlet will
increase. By measuring the differential pressures, we will
have a very good indication of how much the filter has been
choked by dusts. Persons maintaining the air-conditioning plant
should know at what differential a filter should be replaced.
Some of the dust particles are so minute, that they cannot be
seen by the naked eye. In all appearances, the filter looks as
good as new.

These are some factors to consider when determining when to
change the filter:

Mechanical strength of the filter

The final pressure of a filter is usually stated in the product.
That is the strength of the filtration medium. However, other
factors need to be considered - the strength of the filter
walls, frames and holders if not adequately designed can result
in the sagging of the filter housing that will result in leaks.

Changes in efficiency of the filter

This is particularly important in low efficiency filters. Their
efficiencies can be radically impaired as a result of high final
pressure losses. Particles that have been collected by the filter
can become detached and accompany the air stream. Fibrous
particles are less likely to become detached compared to granular
particles. Because of this, higher final pressure drops are
permissible for the former, although this should not exceed
about 200 Pa in a pre-filter.

With granular particles, the final pressure loss should not be
allowed to exceed 100 to 150 Pa.

Fine filters and HEPA filters are less sensitive to changes in
quality. In principle, they can be allowed to have a final
pressure loss up to the limit of their mechanical strength.

Permissible Air flow variations in the system

In this case, the flow pattern is more important than the
particles carried along the air stream. The permissible final
pressure loss here will depend on the total pressure and
characteristics of the fan and any other control facilities.

The filter will affect the air flow as a result of dust
accumulation. The filter has to be changed when the velocity of
the air in a laminar flow installation cannot be maintained or
has fallen below the required specifications.

Bacteriological reasons

Sometimes, the filters are replaced at regular intervals instead
of pre-defined pressure loss indications. This is to prevent
accumulation of bacteria and other microorganisms.

Suitable time window periods

Filters are often changed to coincide with pre-planned plant
shutdown periods. In these cases, production disturbances are
minimized. For example they can be arranged to be changed during
holidays.

Economic considerations

In terms of operating costs, there is an optimum final pressure
point to balance. By having longer intervals between filter
replacements, we do achieve lower filter replacement costs. On the
other hand, this will increase the operating energy costs due to
inefficiency.




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Advertising with Signs

Often called "outside advertising", adverising hoardings
have been an extremely effective way of advertising for many
years. Not only will you see signs advertising products,
but also car stickers, billboards and posters. The list is
endless and the method very effective.

Everywhere you go you will see signs and advertisements,
billboards on the highway and bumper stickers on the backs
of cars. These become so common that sometimes we don~t
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sinks in; we read them and remember and a really good sign
can really get the point across.

Signs and Billboards

Billboards and large signs are everywhere and they do not
have to be as expensive as they once were. You can find,
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A great way of getting the exposure without the large costs
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Bumper stickers and posters and various other signs are all
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printing these up and you can pass them out to customers or
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Shirts and Other Attire

Clothing and accessories are another great method of
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This type of advertising can be done relatively cheaply and
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Contact me at http://www.free-marine.com/emailform.htm


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