Four Bolt Flange

The Hardcast Four Bolt Duct Connection System is designed to provide a simple and effective means of connecting rectangular duct sections together. This connection system may be used on all rectangular duct from 14 GA to 26 GA, resulting in sealed joints with clean lines that are aesthetically pleasing.

Four Bolt Flange Products

Four Bolt Flange Documents

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Tech Tip Volume 12 - Shelf Life and Batch Code Decoding
The Double Fold Offset Seam™ offers superior holding power, tear resistance and fabric protection while adding structural stiffness,yet cuts and works easily.
Manual for the Four Bolt Flange Connection System
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