NMFC 51045 - Metal Air/Smoke Ducts | Class N/A

To find the correct freight class for your shipment:

1. Nest round or spiral ducts and band to skids with corner protectors; cap ends to prevent ovalization and denting, and mark Do Not Stack for long lengths.
2. Box or crate elbows, tees, takeoffs, and dampers; bag hardware and gaskets separately and note piece counts on the BOL for faster check-in.
3. If components include plastic liners, insulation, or gaskets, state “metal with other materials” on paperwork to match the NOI language and avoid reclass delays.
4. Provide exact dims and weight for each handling unit; flag oversize items over 96 in. and use extended skids so duct ends don’t overhang.

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

• Correct NOI reference (NMFC 51045) reduces reclass fees and admin disputes, keeping invoices clean and predictable.
• Damage prevention via nesting, end caps, and banding lowers claim rates on thin-gauge ductwork and delicate fittings.
• Rate optimization by consolidating fittings and standardizing pallets helps avoid oversize surcharges and improves LTL quoting.
• Non-hazardous status broadens carrier options and speeds tendering, improving turnaround for HVAC contractors and metal shops.