According to the NAFA Guide to Air Filtration (1993), low-efficiency prefilters placed upstream of an electronic air cleaner are recommended because:
1.The filters will act as air distribution panels to equalize the air flow through the electronic air cleaner.
2.They will capture large particles that could bridge the electrically charged plates causing a short circuit to deactivate the power supply. If shorting does not occur, arcing caused by large particles can result in excessive power consumption.
3.By preventing arcing, the disturbing "snapping" noise made by the discharges is eliminated.
4.Elimination of arcing helps control ozone generation.
