The PCN mobile ESP electrostatic precipitation filtration unit is a mobile self-contained source capture extraction system designed for intermittent use and rated up to 1,000 CFM. The PCN can be used to remove welding fume, oily smoke or light mist from the air. Contaminant is captured at its source by a unit-mounted 8 inch diameter, 7'/10'/12' long extraction arm, flexible hose or rigid duct using an optional 8 inch inlet collar. The air is then conveyed to the precipitator where it is collected. Clean air is then re-circulated back to the work area. As air approaches the precipitator, it passes through a reusable, aluminum mesh mechanical pre-filter which aids air distribution and removes large particles. Pre-filtered air then passes through an ionizer where particles are charged by corona discharge from a series of small diameter charged tungsten wires centered between grounded plates. Particles then pass through a collection cell, consisting of alternately charged and grounded parallel aluminum plates. Charged plates at the same polarity as the charged particles repel the particles toward the grounded plates which, in turn, attract the particles. Air next passes through a centrifugal blower where it is exhausted vertically through an adjustable outlet grille, back to the work space. An integrally mounted power pack converts 115 volt, single-phase AC power to the high voltage DC required for ionizer and collection cell operation. If required, a HEPA after filter can be added to certain models to provide 99.97% filtration efficiency.