| CPC F28D 7/16 (2013.01) [F28F 9/02 (2013.01)] | 8 Claims | 

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               1. A heat exchanger comprising: 
            a header that guides a refrigerant; and 
                an assembly of heat transfer tubes and fins that is connected to the header and that causes heat exchange between the refrigerant and a medium, wherein 
                the header comprises: 
                a first member having a first surface; 
                  a second member having a second surface that faces the first surface; and 
                  a third member having a third surface that intersects with the first surface and the second surface, 
                the first surface is joined with the second surface by a first brazing material having a first thickness, 
                the third surface is joined with the first member by a second brazing material having a second thickness, 
                the third surface is joined with the second member by the second brazing material, 
                the first thickness is less than the second thickness, and 
                the first thickness is 0.2 mm or less. 
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