NMFC 37330 - Steel Roof Ventilator Tops, SU | Class 150

To find the correct freight class for your shipment:

1. Choose packaging to fit the shape: heavy-duty boxes for simple caps, or a custom wood crate for louvered or flanged tops that need internal bracing.
2. Protect edges and collars with foam, corner boards, and blocking to prevent denting. Fill voids so the set-up unit cannot shift inside the box or crate.
3. Mark orientation and handling notes: “This Side Up,” “Do Not Stack,” and “Fragile Metalwork.” Band the box or crate to a pallet for safer forklift handling.
4. On the BOL, list: “NMFC 37330 – Ventilator Tops, chimney or roof, steel, SU – Class 150.” Select Non-Hazmat and request liftgate or jobsite appointment if needed.

Note: All classifications are subject to Item 170. Verify with official NMFC publications for the most current requirements.

• Predictable pricing with a fixed Class 150 rating—no density math means faster, cleaner LTL quotes and fewer reclassification disputes.
• Proper boxing/crating minimizes transit damage to finished steel surfaces, reducing claims and costly delays on roofing or chimney projects.
• Non-hazardous classification simplifies carrier acceptance and avoids hazmat fees, streamlining tendering and scheduling.
• Crating multiple tops together can cut handling touches and accessorial risk, improving per-unit freight cost for distributors and sheet-metal shops.