When static electricity builds up across a filter (because if the partials passing by the filter) there is a chance that a spark may occur from the fabric of the filter to the nearest steel ground. This happens much as wearing socks on the carpet and touching metal. The spark can cause disastrous results in and explosive environment. A dust as simple as wood can explode into a huge fire.
There are various methods to prevent this. Screen printing a carbon film on the filter media, weaving in stainless, or carbon wires into the media, or spraying a conductive material on the filter. The the theory is that the discharge will travel up the filter which is grounded through a separate ground wire or tail.
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