Patent ID: 8801821

Claim:
An exhaust gas after-treatment device in combination with an airborne dust control arrangement, comprising: said after-treatment device including a body having an outer surface, an exhaust gas inlet formed in the body, an exhaust gas inlet conduit coupled directly to said inlet, and an exhaust gas outlet formed in the body, an exhaust gas outlet conduit coupled directly to said outlet, the after-treatment device further including an after-treatment element contained in said body between said exhaust gas inlet and said exhaust gas outlet for treating the exhaust gas to reduce products of incomplete combustion and through which the exhaust gas passes as the exhaust gas travels from the exhaust gas inlet through said after-treatment element and to the exhaust gas outlet; said dust control arrangement including a shield formed exclusive of said inlet conduit and said outlet conduit and comprising an inner surface and an outer surface, with the outer surface being surrounded by atmospheric air, the shield extending around at least an upper portion of the outer surface of the body of the after-treatment device and defining a space including at least an upper portion between the at least upper portion of the outer surface of the body and the inner surface of the shield, with the space being exposed directly to the atmospheric air surrounding the shield; and a means for pressurizing the space by communicating at least a portion of the exhaust gas exiting the exhaust gas outlet with the space so as to exclude the atmospheric air surrounding the shield from the space.