## Common ground
All options refer to devices or preparations designed to disperse aroma or essential oils into the air for scenting indoor environments.
## Options at a glance
**3307.41 – Incense-type burning**
- **Defining trait:** Designed to be burned, releasing fragrance through combustion.
- **Typical examples:** Incense sticks, agarbatti, scented cones.
- **Best fit when:** The product is meant to be lit and burned for scent.
**3307.49 – Non-electric odoriferous preparations**
- **Defining trait:** Contains no electrical components; relies on passive evaporation or absorption.
- **Typical examples:** Scented stones, gel air fresheners, scented candles (non-electric).
- **Best fit when:** No power source or mechanical action is involved.
**8414.80 – Electric air pump diffusers**
- **Defining trait:** Uses an electric fan or compressor to blow air over oil-soaked pads or wicks.
- **Typical examples:** Fan-based diffusers with essential oil pads.
- **Best fit when:** Air is actively blown through the oil via a motorized fan.
**8424.89 – Mechanical spray atomizers**
- **Defining trait:** Uses mechanical force (pump or pressure) to spray liquid into fine droplets.
- **Typical examples:** Pump-spray room sprays, handheld misters with essential oils.
- **Best fit when:** Liquid is dispersed via physical spraying mechanism.
**8479.89 – Vibration-based diffusers**
- **Defining trait:** Uses mechanical vibration (e.g., motor-driven) to break oil into droplets.
- **Typical examples:** Motorized ultrasonic-like diffusers without piezoelectric elements.
- **Best fit when:** Mechanical movement breaks the liquid, not sound waves.
**8509.80 – Diffusers with electric motors**
- **Defining trait:** Contains an internal electric motor for operation (e.g., rotating wicks or fans).
- **Typical examples:** Motor-driven diffusers with spinning disks or fans.
- **Best fit when:** The product uses a motor as its core operating mechanism.
**8516.79 – Electric heating evaporators**
- **Defining trait:** Heats oil using resistive elements, ceramic heaters, or bulbs to evaporate scent.
- **Typical examples:** Electric oil warmers, heated diffusers with bulbs.
- **Best fit when:** Heat is used to vaporize the oil.
**8543.70 – Ultrasonic piezoelectric diffusers**
- **Defining trait:** Uses ultrasonic vibration via a piezoelectric transducer to atomize oil.
- **Typical examples:** Common "ultrasonic" diffusers with water and essential oils.
- **Best fit when:** The device uses high-frequency sound waves to create mist.
## Key differences
| HS Code | Core Mechanism | Power Source | Atomization Method |
|--------|-----------------------|------------------|----------------------------|
| 3307.41 | Burning | None | Combustion |
| 3307.49 | Passive evaporation | None | Natural diffusion |
| 8414.80 | Electric fan | Electric | Air flow over oil |
| 8424.89 | Mechanical spray | Electric (pump) | Pressure-based spraying |
| 8479.89 | Mechanical vibration | Electric (motor) | Physical shaking/movement |
| 8509.80 | Electric motor | Electric | Motor-driven dispersal |
| 8516.79 | Electric heating | Electric | Thermal evaporation |
| 8543.70 | Ultrasonic vibration | Electric | Piezoelectric sound waves |
## How to choose
- Does it burn? → 3307.41
- Is it non-electric and passive? → 3307.49
- Does it use a fan or air pump? → 8414.80
- Does it spray liquid via pressure? → 8424.89
- Does it vibrate mechanically (not ultrasonic)? → 8509.80 or 8479.89
- Is heat used to evaporate oil? → 8516.79
- Does it use high-frequency sound waves? → 8543.70
## Overlaps & pitfalls
- **Overlaps:** Some devices may combine methods (e.g., a heated diffuser with a fan). The primary function determines the correct HS code.
- **Pitfalls:** "Diffuser" is ambiguous—some use heat, others sound waves. Always prioritize the **main dispersal method**. If multiple mechanisms exist, choose based on the dominant one