## Common ground
All options refer to non-mechanical fans or ventilators, meaning they operate without electric motors or moving parts (e.g., passive airflow devices).
## Options at a glance
**3925.90 – Made of plastic material**
- **Defining trait:** Constructed primarily from plastic, offering lightweight and corrosion-resistant properties.
- **Typical examples:** Plastic attic vents, mesh louvers, roof-mounted passive ventilators.
- **Best fit when:** The fan is lightweight, used in outdoor or humid environments where metal would rust.
**7326.90 – Made of iron or steel**
- **Defining trait:** Constructed from iron or steel, providing greater durability and strength.
- **Typical examples:** Steel roof vents, industrial exhaust grilles, heavy-duty wall ventilators.
- **Best fit when:** The fan must withstand high wind, impact, or long-term exposure to harsh conditions.
## Key differences
| Feature | 3925.90 (Plastic) | 7326.90 (Iron/Steel) |
|---------------------|--------------------------|----------------------------|
| Material | Plastic | Iron or steel |
| Weight | Light | Heavy |
| Corrosion resistance| High | Low (unless coated) |
| Durability | Moderate | High |
## How to choose
- Is the fan made of plastic? → 3925.90
- Is it made of iron or steel? → 7326.90
## Overlaps & pitfalls
A product could be made of both materials (e.g., steel frame with plastic louvers), but only one material should define the HS Code. If unclear, prioritize the **main structural material**. The term "non-mechanical" applies to both—no conflict. Avoid confusion by focusing on the dominant material in construction