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The M&M Manufacturing 504MS16 is a metal spin-in starting collar designed for efficient duct connection. This unit features a damper and a one-quarter inch bearing. It is made from twenty-six gauge steel for enhanced durability and performance.
The spin-in starting collar is essential for connecting ducts securely and ensuring optimal airflow.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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