An oil separator includes a case and introduces blow-by gas of an internal combustion engine into the case. The oil separator then separates oil from the blow-by gas and discharges the separated oil from the case. The case incorporates electrode plates, which are arranged at intervals and face each other. A filter is arranged between any adjacent two of the electrode plates. The filter is formed of fibers, which are made of an electrically insulating first material, or polyester. A potential difference is created between the electrode plates.

An oil separator includes a case and introduces blow-by gas of an internal combustion engine into the case. The oil separator then separates oil from the blow-by gas and discharges the separated oil from the case. The case incorporates electrode plates, which are arranged at intervals and face each other. A filter is arranged between any adjacent two of the electrode plates. The filter is formed of fibers, which are made of an electrically insulating first material, or polyester. A potential difference is created between the electrode plates.

Implementations disclosed herein provide a compact downdraft table comprising a spark arrestor oriented below a work surface, a vertically oriented cylindrical filter cartridge located below the work surface, a fan assembly that draws air through the work surface, the spark arrestor, and the filter cartridge and exhausts filtered air out of the downdraft table, a purge assembly that discharges purged air to an interior of the filter cartridge to purge particulates collected on an exterior of the filter cartridge, wherein the spark arrestor, filter cartridge, fan assembly, and purge assembly are all contained within a main housing for the downdraft table.