US Patent 7603852 Exhaust gas purification apparatus

An exhaust gas purification apparatus 10 includes an engine 20, a manifold 22 connected to the engine 20 and through which exhaust gas generated by burning fuel flows, and a casing 26 connected to the manifold 22 and holding a honeycomb filter 30 with a catalyst carried thereon. In the exhaust gas purification apparatus 10, the honeycomb filter 30 is disposed in a position such that the length of an exhaust gas route between the uppermost upstream portion of the manifold 22 through which exhaust gas flows and the head portion of the honeycomb filter 30 is about 1 m or less. The honeycomb filter 30 has a porosity of about 70% or more.