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Diesel particulate filter, filters the particulate matter by forcing the exhaust gases to pass through a ceramic wall flow filter. The ceramic wall flow filter features a porous wall and is single ended. When the spent gases are forcibly passed through the porous wall, the particulate matter is filtered along with the gas is discrete thereby lowering the particulate emission inside atmosphere. 3. How confident they are Widely respected for its expertise in high-end aluminium glazing products, Fenster was approached by programme-makers and asked to supply a premium-quality sliding door.