Variable Efficiency Although electrostatic systems are very efficient when the collection plates are clean, the efficiency drops off drastically as the plates become covered with particles. ![]() Exposure to coolant and oil mist may damage certain types of filter media. ![]() Not for Mist Most media filters are designed to collect dry pollutants such as smoke and dust. Reduced throughput means reduced collection, allowing contaminants to escape into the shop air. It is important to maintain the correct throughput of any collection system. Depending upon the cost of the filters and the replacement frequency, this type of system can be quite expensive to operate over the long term.ĭecreased Throughput Another problem with multi-stage filter units is that the throughput of the system, measured in cfm, decreases as contaminants become trapped in the pores of the filters. Usually they are made from media that cannot be cleaned, so the only alternative is replacement. ![]() These filters are designed to retain contaminants, so they will become clogged with use. High Operating Costs The biggest drawback of media-type filtration systems is the high operating cost associated with replacement filters.
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