NMFC 37370 - Metal Roof Ridge Ventilators | Density Class

To find the correct freight class for your shipment:

1. Confirm the item is a continuous, all-metal ridge ventilator with no blowers or moving parts; mixing in powered units triggers a different NMFC.
2. Pack in rigid boxes or wood crates with edge guards and internal blocking so the ridge profile can’t crush or bow during LTL cross-docking.
3. Weigh each package and compute density using the full exterior cubic footage of the box or crate to align with Item 170 density-based classes.
4. Mark long lengths with center-of-gravity and no-fork points; add top-load protection or load spreaders if stacking could deform the vent.

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

• Density-based classification rewards tighter, smarter packing, often lowering class and cutting LTL costs for long but lightweight vents.
• Accurate NMFC 37370 use reduces reclass fees, rebills, and inspection delays—keeping roofing projects on schedule.
• Crated, braced packaging lowers damage risk and claim rates, protecting thin metal edges and factory-finished surfaces.
• Non-hazardous status broadens carrier options and helps secure competitive rates without special handling surcharges.