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Hardcast brand of HVAC products are
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Dyn-O-Rail™ -- Sturdy Embossed-for-Stiffness Design - 23 gauge steel.
For use with Single or Hollow Vanes - up to 16 gauge steel. Relief Holes in slots help hold vanes during assembly. Bevel Edges remain straight for better contact. Use VANE SETTERTM tool and assembly jig for perfect results.