Tariff classification turns on essential function: air handling units fall under air-conditioning machinery, while ventilation units are air circulators.

Classification depended on the essential function of each product. The air handling unit, used in a central air-conditioning system and fitted with temperature-control elements, was treated as air-conditioning machinery under heading 8415 rather than the residual heading 8414, so it was classified under 8415 90 00. The ventilation unit, having no temperature control and functioning as an air circulator by exhausting old air and drawing in fresh air through filtration, was treated as a fan-related product under chapter 8414, so it was classified under 8414 59 10 instead of 8415 90 00. The ruling applied the specific tariff entry covering the goods' essential function over broader or residual headings.

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Issues: (i) Whether the air handling unit supplied by the applicant was classifiable under heading 8414 80 90 or under 8415 90 00; (ii) whether the ventilation unit supplied by the applicant was classifiable under heading 8414 80 90 or under 8415 90 00.

Issue (i): Whether the air handling unit supplied by the applicant was classifiable under heading 8414 80 90 or under 8415 90 00.

Analysis: The classification turned on the nature and function of the goods. The air handling unit was found to be used in a central air-conditioning system and to contain temperature control elements, so it answered the description of air-conditioning machinery comprising a motor-driven fan and elements for changing temperature and humidity. Since heading 8415 specifically covered such machines and parts thereof, the residual heading 8414 80 90 was held not to apply.

Conclusion: The air handling unit was classifiable under heading 8415 90 00, against the applicant.

Issue (ii): Whether the ventilation unit supplied by the applicant was classifiable under heading 8414 80 90 or under 8415 90 00.

Analysis: The ventilation unit was found to have no temperature control and to function as an air circulator by exhausting old air and drawing in fresh air through filtration. On that functional basis, it was treated as an air circulator falling within the fan-related heading under chapter 8414, rather than as a part of air-conditioning machinery under heading 8415.

Conclusion: The ventilation unit was classifiable under heading 8414 59 10, not under heading 8415 90 00.

Final Conclusion: The ruling settled the classification of both products by applying their functional attributes and the tariff entries specifically covering air-conditioning machinery and air circulators.

Ratio Decidendi: Where a tariff entry specifically covers the goods by their essential function, classification must follow that specific entry rather than a residual heading or a broader description of parts.

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