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To complete the stylish extension, a number of the property’s existing hardwood windows have also been sympathetically replaced. Tasked with identifying a system that could match the visual appeal of the original wooden frames whilst offering improved quality, usability and security, the Dortech team took the innovative step of suggesting a change to aluminium. After reviewing alternative products on the market, Senior’s high quality PURe® aluminium windows were found to significantly outperform cheaper aluminium systems and offer the perfect solution in terms of both performance and aesthetics. The EGR system routes a number of the exhaust gases (6 ? 10%) over the EGR valve, in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they cannot burn within the combustion chamber; also, the exhaust gases take up many of the space which will rather be taken from the intake air. This reduces the level 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.