Unitron Tempest Moisture Protection Vent
Hydrophobic vent filter for Unitron Tempest hearing aids preventing cerumen and moisture ingress. Classified 9021.90.4040 as protective accessory integral to hearing disability compensation devices.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If industrial air filters
Non-medical filters classify under machinery parts, excluding Chapter 90 technical uses.
If simple plastic filter media
Generic filtration plastics go to Chapter 39.
If textile filter components
If textile-based, technical textiles heading applies per note 1(a).
Not sure which classification is right?
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Import Tips & Compliance
• Include IP57 waterproof test results; specify micron pore size for function proof; declare as kit component if sold with domes
Related Products under HTS 9021.90.40.40
Hansaton Sound Transmitter Clip
Remote microphone clip-on transmitter for Hansaton hearing aids extending audio pickup range. HTS 9021.90.4040 as carried accessory compensating hearing defects via wireless audio relay.
Oticon Opn Volume Control Wheel
Tactile volume adjustment wheel for Oticon Opn BTE hearing aids providing manual gain control. Classified 9021.90.4040 as integral user interface part for disability compensation appliances.
Phonak Lyric Extended Wear Shell
Custom-molded shell for Phonak Lyric 24/7 deep canal hearing aids designed for 2-month wear. HTS 9021.90.4040 as implantable body-worn part per orthopedic appliance notes for defect compensation.
Widex Evoke Program Switch Button
Push-button program selector for Widex Evoke platform switching DSP modes on-the-fly. 9021.90.4040 as dedicated control accessory for carried hearing aids compensating disability.
ReSound ONE Custom In-the-Ear Shell
Patient-specific ITE shell for ReSound ONE hearing aids milled from acrylic for precise fit. HTS 9021.90.4040 per notes for parts principally used in orthopedic hearing appliances.
Oticon Hearing Aid Microphone Module
Replacement microphone assembly specifically designed for Oticon hearing aids, capturing and converting sound waves into electrical signals for amplification. Classified under HTS 9021.90.4040 as a dedicated part for hearing aids per Chapter 90 note on parts suitable solely for such appliances. Ensures clear audio input for users with hearing impairment.