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The EGR system routes many of the exhaust gases (6 ? 10%) through the EGR valve, last on the Intake System, and in the end in the combustion chamber. The exhaust gases are inert i.e. they don't burn within the combustion chamber; also, the exhaust gases use up a number of the space which could preferably be taken with the intake air. This decreases the volume of intake air available for the combustion process during each Power Stroke; which experts claim decreases the peak combustion temperatures. This leads to lower NOx emissions. The components of d?cor in metal sketches are produced using metals like copper, wrought iron, metal wires along with other such materials. The pieces include wall mirrors, metal candle holders, large wall clocks, wall hangings and wall shelves. These are available in home d?cor showrooms, along with internet vendors.