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Diesel particulate filter (DPF) systems clean and remove particles and soot from the exhaust gas. With soot and particulates burnt off through an active regeneration event, where fuel is injected and burnt off raising the temperature to fully oxidise the soot, and catalysed filter elements allow passive regeneration to oxidise the soot. Specified, designed and tested by Perkins for optimum fuel economy, performance and to reliably meet emissions standards.