4" Aluminum Starting Collar

4" Aluminum Starting Collar

A light weight, circular HVAC fitting used to create a smooth, airtight connection from a flat surface (like a plenum or duct board) to a round duct, featuring tabs that bend to secure it and allow for sealing.

• Aluminum makes it easy to mold and install
• Popular for smaller duct runs due to its lightweight nature and ease of bending
• Requires duct sealant to ensure an airtight seal

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