9902.15.55 - Exhaust fans designed for permanent ceiling installation in bathrooms, each with a self-contained electric DC brush-less motor with an output wattage not exceeding 125 W, with or without a light, such fans having a sound level rating greater than 0.1 sone but not exceeding 1.2 sones (provided for in subheading 8414.51.30)

This HTS category, 9902.15.55, specifically classifies exhaust fans intended for permanent installation in bathrooms. Key defining features include a self-contained electric DC brush-less motor with a maximum output wattage of 125 W. These fans may also incorporate a lighting element. A crucial distinguishing characteristic for classification within this provision is their sound level rating, which must fall between 0.1 sone and 1.2 sones, inclusive. This specific range addresses a particular performance characteristic that differentiates them from other fan types.

As this is a leaf node within the Harmonized Tariff Schedule, there are no further subcategories to explore. The classification is precisely defined by the detailed description provided, focusing on the functional application (bathroom exhaust), motor type and power, and a defined sound performance metric. This level of specificity ensures that only exhaust fans meeting all these criteria are classified under 9902.15.55, thereby distinguishing them from general-purpose fans or those with different motor specifications or noise levels, which would be classified under other headings, such as 8414.51.30 as referenced.