Heat exchanger exemption under Notification 51/93 failed because cooling and condensing equipment fell within the express exclusion.

Heat exchangers were treated as machinery used for cooling or condensing materials and therefore fell within the express exclusion from exemption under Notification 51/93, even though the goods were classified under tariff heading 84.19. The later notifications and Section 11C relief were noted as limiting the duty burden for the relevant period, but they did not change the underlying classification position against the assessee. On that basis, the exemption claim failed and the demand was upheld.

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Issues: Whether heat exchangers were excluded from the exemption under Notification 51/93 as machinery, plant or laboratory equipment for the treatment of materials by condensing or cooling, and whether the subsequent notifications and Section 11C relief justified interference with the demand.

Analysis: The exemption under Notification 51/93 covered goods of tariff heading 84.19 but expressly excluded machinery, plant and laboratory equipment used for treatment of materials by condensing or cooling. Heat exchangers perform a cooling or condensing function by treating fluids so that heat exchange takes place, and therefore fell within the excluded category. The later notifications and the relief under Section 11C only limited the duty burden for the relevant period and did not alter the basic classification point against the assessee.

Conclusion: The exemption claim failed, and the demand was upheld against the assessee.

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