NMFC 51164 – Metal Duct/Flue Expansion Joints | Class 150

To find the correct freight class for your shipment:

1. Quote LTL using NMFC 51164 at Class 150; no density or dimensional rating needed for this item.
2. Palletize and brace each joint; cap open ends, shield flanges and bellows, and wrap gaskets or liners to prevent impact and debris intrusion.
3. Use corner protectors and “Do Not Crush/This Side Up” labels; avoid top-stacking to protect telescoping sleeves and formed bellows.
4. Describe clearly on the BOL: “Metal expansion joints for air/gas ducts or flues,” include piece count, material (steel/aluminum), and largest OD or flange size.

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

• Predictable Class 150 rating enables accurate rate shopping and reduces reweigh/reclass penalties.
• Non-hazardous status broadens carrier options and avoids HazMat fees and delays.
• Correct NMFC under the Conduits group supports audit compliance and lowers chargeback risk for HVAC and industrial ventilation shipments.
• Damage-preventive packaging guidance cuts claim costs and reshipments, keeping installation schedules on track.