NMFC 37140 – Aluminum Skylight Frames/Curbs | Class N/A

To find the correct freight class for your shipment:

1. Bundle frames with wood separators and corner guards, then strap to a skid so no edges overhang; use 96-inch pallets for long roof frames to prevent bending.
2. Nest aluminum mounting curbs when possible and cap open sides with plywood; stretch-wrap tightly and mark Do Not Stack to avoid flange deformation.
3. Choose rigid crating for glazed-ready frames or fragile profiles; orient the longest side along pallet stringers and add cross-bracing to resist racking.
4. Document materials and counts clearly: note aluminum construction, piece dimensions, and whether items are frames or curbs; include shop drawings for precise NMFC mapping.

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

• Reduced claims by protecting thin aluminum edges and mating flanges, cutting costly rework and jobsite delays for roofers and glaziers.
• Cleaner billing: citing NMFC 37140 minimizes reclass disputes and speeds quotes, even when no fixed class range is published.
• Lower freight spend by nesting curbs and using right-size pallets, trimming cube and accessorials like residential or liftgate deliveries.
• Broader carrier options thanks to non-hazardous status, enabling competitive LTL rates and faster transit selection.