## Common ground
All options refer to ventilation grills—perforated or slotted panels used to allow airflow in buildings or equipment.
## Options at a glance
**3926.30 – Plastic material**
- **Defining trait:** Made primarily from plastic (e.g., polypropylene, PVC), offering lightweight and corrosion-resistant properties.
- **Typical examples:** Bathroom exhaust grills, HVAC duct covers, indoor air vents in appliances.
- **Best fit when:** The grill is lightweight, non-metallic, and used in moisture-prone or low-load environments.
**7326.90 – Iron or steel**
- **Defining trait:** Constructed from ferrous metal (iron or steel), providing high strength and durability.
- **Typical examples:** Industrial ventilation grills, heavy-duty HVAC units, fire-rated grilles in commercial buildings.
- **Best fit when:** The grill must withstand high pressure, heat, or physical stress; common in industrial or safety-critical applications.
## Key differences
| Feature | 3926.30 (Plastic) | 7326.90 (Iron/Steel) |
|------------------|--------------------------|----------------------------|
| Material | Plastic (non-metallic) | Ferrous metal |
| Weight | Light | Heavy |
| Durability | Moderate (can degrade) | High (resists deformation) |
| Use case | Residential, indoor | Industrial, high-risk |
## How to choose
- Is the grill made of plastic or a non-metallic material? → 3926.30
- Is it made of iron, steel, or another ferrous metal? → 7326.90
## Overlaps & pitfalls
A grill could be made of coated steel (e.g., painted iron) and still fall under 7326.90, even if it looks plastic-like. Conversely, some plastic grills may have metal reinforcements—these should be classified by the primary material. **No priority rule is specified; classify based on the dominant material.**