(57) Typical plate fin heat exchangers 1 use inherently difficult to manufacture square
and sine wave fin plates 12, 13, 14 and thus, the range of materials with which plate
fin heat exchangers can be manufactured is curtailed a plate fin heat exchanger in
which fins (25) are separately formed of self-standing or supporting strips. The fins
(25) being constructed to have step or side projectioons (26, 27; 45, 46, 47, 48;
51, 52, 53) to ensure a self supporting nature whilst allowing the fins to be secured
to parallel plates (2, 3, 4, 5) of the heat exchanger. These projections (26, 27;
45, 46, 47, 48; 51, 52, 53) also being arranged additionally to space the parallel
plates (2, 3, 4, 5) or additional projections being provided solely for this function.
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