Patent ID: 7442035

Claim:
A stack bustle for use in a gas exhaust system having an exhaust stack, the stack bustle comprising: a circumferential piping section co-extensive with the exhaust stack, the circumferential piping section including a first wall and a second wall; an orifice disposed within the first wall of the circumferential piping section or in the exhaust stack, the orifice adapted to be connected to a gas transfer pipe for transferring gas from the circumferential piping section; and a plurality of slots disposed within the second wall of the circumferential piping section or within the exhaust stack, the plurality of slots forming a fluid passageway between the exhaust stack and the circumferential piping section, the plurality of slots being circumferentially disposed around the circumferential piping section or the exhaust stack, wherein an area profile of the plurality of slots differs at different circumferential locations of the circumferential piping section or exhaust stack.