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Diffuser (thermodynamics) A diffuser is a device for reducing the velocity and increasing the static pressure of a fluid passing through a systemâ. Diffusers are used to slow the fluid's velocity while increasing its static pressure. The fluid's static pressure rise as it passes though a duct is commonly referred to as pressure recovery.
In an attempt to reduce diesel exhaust pollutants, the concept of the Exhaust Gas Recirculation (EGR) system was implemented on all diesel trucks around the year 2007, per EPA regulations. The purpose being, to reduce nitrogen oxide emissions, which contribute to air pollution.