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Gas Turbine Inlet Treatment 119<br />

Figure 8-2. Courtesy of American Air Filter International. A typical<br />

24" x 24" barrier filter. Note the insert sketch that details the internal<br />

labyrinth, which provides a large media surface area while maintaining<br />

a constant filter frontal area.<br />

maintain the filter efficiency level. These filters evolved for desert and<br />

arctic regions where blowing sand or snow would quickly overload<br />

and clog the barrier type filter. Cannister filters are very effective at<br />

and above 5.0 microns. However, in areas where the major contamination<br />

is from particulate at and below 2.0 microns, cannister filters<br />

alone are inadequate. Attempts to improve the overall efficiency by

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