A system for managing the removing contaminants from gaseous streams, such as an exhaust stream, the system comprising: a combustion system producing an exhaust stream; a tempering air system comprising: a housing forming an interior region; one or more cooling components (904, 906, 908) disposed within the interior region, each of the one or more cooling components (904, 906, 908) configured to: receive at least a portion of the exhaust stream; draw a cooling stream based on the at least a portion of the exhaust stream, wherein draw of the cooling stream relies on the Venturi effect and/or Bernoulli's principle based on the velocity of the at least a portion of the exhaust stream; mix the cooling stream with the at least portion of the exhaust stream to form a mixed stream, wherein the temperature of the mixed stream is lower than the temperature of the at least a portion of the exhaust stream; and an exhaust treatment system configured to receive the mixed stream and to remove one or more contaminants from the mixed stream characterized by one or more sensors (1004, 1006, 1008, 10010) configured to measure temperature; a regulator configured to adjust the volume of cooling stream drawn into one of the one or more cooling components (904, 906, 908); a control unit in communication with the one or more sensors (1004, 1006, 1008, 10010) and the regulator; wherein the control unit is configured to: obtain temperature measurements from the one or more sensors (1004, 1006, 1008, 10010): determine whether the temperature measurements are within a threshold; and transmit a notification to the regulator to adjust of the volume of cooling stream drawn into one of the one or more cooling components (904, 906, 908). a combustion system producing an exhaust stream; a tempering air system comprising: a housing forming an interior region; one or more cooling components (904, 906, 908) disposed within the interior region, each of the one or more cooling components (904, 906, 908) configured to: receive at least a portion of the exhaust stream; draw a cooling stream based on the at least a portion of the exhaust stream, wherein draw of the cooling stream relies on the Venturi effect and/or Bernoulli's principle based on the velocity of the at least a portion of the exhaust stream; mix the cooling stream with the at least portion of the exhaust stream to form a mixed stream, wherein the temperature of the mixed stream is lower than the temperature of the at least a portion of the exhaust stream; and an exhaust treatment system configured to receive the mixed stream and to remove one or more contaminants from the mixed stream characterized by one or more sensors (1004, 1006, 1008, 10010) configured to measure temperature; a regulator configured to adjust the volume of cooling stream drawn into one of the one or more cooling components (904, 906, 908); a control unit in communication with the one or more sensors (1004, 1006, 1008, 10010) and the regulator; wherein the control unit is configured to: obtain temperature measurements from the one or more sensors (1004, 1006, 1008, 10010): determine whether the temperature measurements are within a threshold; and transmit a notification to the regulator to adjust of the volume of cooling stream drawn into one of the one or more cooling components (904, 906, 908). a housing forming an interior region; one or more cooling components (904, 906, 908) disposed within the interior region, each of the one or more cooling components (904, 906, 908) configured to: receive at least a portion of the exhaust stream; draw a cooling stream based on the at least a portion of the exhaust stream, wherein draw of the cooling stream relies on the Venturi effect and/or Bernoulli's principle based on the velocity of the at least a portion of the exhaust stream; mix the cooling stream with the at least portion of the exhaust stream to form a mixed stream, wherein the temperature of the mixed stream is lower than the temperature of the at least a portion of the exhaust stream; and receive at least a portion of the exhaust stream; draw a cooling stream based on the at least a portion of the exhaust stream, wherein draw of the cooling stream relies on the Venturi effect and/or Bernoulli's principle based on the velocity of the at least a portion of the exhaust stream; mix the cooling stream with the at least portion of the exhaust stream to form a mixed stream, wherein the temperature of the mixed stream is lower than the temperature of the at least a portion of the exhaust stream; and an exhaust treatment system configured to receive the mixed stream and to remove one or more contaminants from the mixed stream characterized by one or more sensors (1004, 1006, 1008, 10010) configured to measure temperature; a regulator configured to adjust the volume of cooling stream drawn into one of the one or more cooling components (904, 906, 908); a control unit in communication with the one or more sensors (1004, 1006, 1008, 10010) and the regulator; determine whether the temperature measurements are within a threshold; and transmit a notification to the regulator to adjust of the volume of cooling stream drawn into one of the one or more cooling components (904, 906, 908).