The importer should first work through the relevant tariff schedule headings for specific electrothermic appliances — such as those covering cooking appliances, hairdressing apparatus, or smoothing irons — to confirm none captures the product's principal function. If no specific heading applies, the NES heading is appropriate. A binding ruling request to CBP is the most reliable way to lock in the classification for high-volume or novel products.

Generally yes, because air fryers and multi-function cookers combine heating methods (convection, pressure, or steam) that do not fit neatly into the headings for conventional ovens or cooking plates. However, classification can depend on the unit's dominant function, so importers should review CBP rulings for comparable products and consult a licensed customs broker before committing to a classification.