divert the flue gas in the flue gas flow path into a first flow path outside of the diverter relative to the longitudinal axis and a second flow path at least partially separated from the first flow path by the diverter application_number US 201414253065 A description at the outset it should be clearly understood that like reference numerals are intended to identify the same structural elements portions or surfaces consistently throughout the several drawing figures as such elements portions or surfaces may be further described or explained by the entire written specification of which this detailed description is an integral part unless otherwise indicated the drawings are intended to be read e g cross hatching arrangement of parts proportion degree etc together with the specification and are to be considered a portion of the entire written description of this invention as used in the following description the terms u201c horizontal u201d u201c vertical u201d u201c left u201d u201c right u201d u201c up u201d and u201c down u201d as well as adjectival and adverbial derivatives thereof e g u201c horizontally u201d u201c rightwardly u201d u201c upwardly u201d etc simply refer to the orientation of the illustrated structure as the particular drawing figure faces the reader similarly the terms u201c inwardly u201d and u201c outwardly u201d generally refer to the orientation of a surface relative to its axis of elongation or axis of rotation as appropriate referring now to the drawings and more particularly to fig1 thereof an improved heat exchange.