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The M&M 503ATH5 is a five-inch air tite start collar designed for air distribution systems. This product facilitates the connection of ducts to branch lines, ensuring a secure fit and optimal air flow.
This start collar is ideal for HVAC professionals looking for reliable duct connections.
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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