A cross flow inversion baffle for mixing a fluid flow, comprising: a divider wall having a first side and a second side; a first perimeter flow diverter including a first diverter portion, a second diverter portion and a third diverter portion, said third diverter portion is disposed between said first and second diverter portions (54a, 54b) and is angled with respect to a flow direction, said first and second diverter portions (54a, 54b) extending to said first side of the divider wall, and the third diverter portion includes an inner edge that is spaced from the divider wall; a first center-to-perimeter flow portion disposed at least partially between the first perimeter flow diverter and the first side of the divider wall, the first center-to-perimeter flow portion including a first chamber wall defining a first flow chamber; a first perimeter-to-center flow portion disposed at least partially between the first perimeter flow diverter and the first side of the divider wall, the first perimeter-to-center flow portion including a second chamber wall defining a second flow chamber; a second perimeter flow diverter including a first diverter portion, a second diverter portion and a third diverter portion, said third diverter portion is disposed between said first and second diverter portions (74a, 74b) and is angled with respect to the flow direction, said first and second diverter portions (74a, 74b) extending to said second side of the divider wall, and the third diverter portion includes an inner edge that is spaced from the divider wall; a second center-to-perimeter flow portion disposed at least partially between the second perimeter flow diverter and the second side of the divider wall, the second center-to-perimeter flow portion including a third chamber wall defining a third flow chamber; and a second perimeter-to-center flow portion disposed at least partially between the second perimeter flow diverter and the second side of the divider wall, the second perimeter-to-center flow portion including a fourth chamber wall defining a fourth flow chamber; wherein the fluid flow is divided by the divider wall, and fluid flowing in the center of the fluid flow moves to the perimeter of the fluid flow through the first and third flow chambers (56,76), and fluid flowing in the perimeter of the fluid flow moves to the center of the fluid flow through the second and fourth flow chambers (58,78). a divider wall having a first side and a second side; a first perimeter flow diverter including a first diverter portion, a second diverter portion and a third diverter portion, said third diverter portion is disposed between said first and second diverter portions (54a, 54b) and is angled with respect to a flow direction, said first and second diverter portions (54a, 54b) extending to said first side of the divider wall, and the third diverter portion includes an inner edge that is spaced from the divider wall; a first center-to-perimeter flow portion disposed at least partially between the first perimeter flow diverter and the first side of the divider wall, the first center-to-perimeter flow portion including a first chamber wall defining a first flow chamber; a first perimeter-to-center flow portion disposed at least partially between the first perimeter flow diverter and the first side of the divider wall, the first perimeter-to-center flow portion including a second chamber wall defining a second flow chamber; a second perimeter flow diverter including a first diverter portion, a second diverter portion and a third diverter portion, said third diverter portion is disposed between said first and second diverter portions (74a, 74b) and is angled with respect to the flow direction, said first and second diverter portions (74a, 74b) extending to said second side of the divider wall, and the third diverter portion includes an inner edge that is spaced from the divider wall; a second center-to-perimeter flow portion disposed at least partially between the second perimeter flow diverter and the second side of the divider wall, the second center-to-perimeter flow portion including a third chamber wall defining a third flow chamber; and a second perimeter-to-center flow portion disposed at least partially between the second perimeter flow diverter and the second side of the divider wall, the second perimeter-to-center flow portion including a fourth chamber wall defining a fourth flow chamber; wherein the fluid flow is divided by the divider wall, and fluid flowing in the center of the fluid flow moves to the perimeter of the fluid flow through the first and third flow chambers (56,76), and fluid flowing in the perimeter of the fluid flow moves to the center of the fluid flow through the second and fourth flow chambers (58,78).