7321.90.40.00 - Door assemblies, incorporating more than one of the following: inner panel, outer panel, window, insulation

This HTS category, 7321.90.40.00, specifically covers door assemblies designed for nonelectric domestic appliances of iron or steel, as outlined in heading 7321. The defining characteristic of these door assemblies is the incorporation of multiple components, including an inner panel, an outer panel, a window, and insulation. This multifaceted construction differentiates them from simpler parts and emphasizes their role in the complete functioning and design of the appliance.

Distinction from sibling categories is crucial for accurate classification. While 7321.90.10.00 covers assembled cooking chambers, and 7321.90.20.00 pertains to top surface panels with or without burners or controls, 7321.90.40.00 is solely focused on the complete door assembly. Other parts not falling into these specific categories would be classified under the residual category 7321.90.50.00.

As this is a leaf node in the HTS structure, there are no further subcategories. Therefore, the focus remains on the precise definition and distinguishing features of these multi-component door assemblies. Classification into this subheading hinges on the presence and integration of at least an inner panel, outer panel, window, and insulation within the door assembly.