(57) @ A heat exchanger such as a vehicle radiator comprises a pair of tube plates 11,12
between which flat tubes 13 extend, interspersed with corrugated fins forming airways
14. Header tanks are formed by attaching shells (not shown) to the tube plates. In
production of the radiator, the tubes and airways are assembled, between clamping
channels 17, as a separate item. To hold the matrix together, ties 16 hold the clamping
channels together. The ties have end portions 17 which are bent laterally with respect
to the axes of the ties, and which extend in different, preferably substantially opposite
directions. Thus the ties can only be removed from the apertures in the channels by
twisting the ties about their axes, and thus cannot jump out as a result of vibration.
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