GAF Master Flow 12 in. Duct Board Starting Collar with Damper
GAF Master Flow 12 in. Duct Board Starting Collar with Damper
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GAF Master Flow 12 in. Duct Board Starting Collar with Damper

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Key item features

  • Provides a transition from a flat surface to round pipe or insulated flexible duct for HVAC systems
  • Built-in damper allows precise airflow control to improve system efficiency
  • Manufactured from galvanized steel for strength, durability, and long-lasting use
  • Extra-long tabs fit duct board thicknesses up to 1-1/2 in. (or R-6 value)
  • Compatible with both internally lined and unlined plenums for versatile use
  • Universal compatibility makes it suitable for most HVAC applications
  • Designed for easy installation using sheet metal screws (not included)
  • Airtight design helps minimize air leaks and enhances energy efficiency
  • Seal seams with code-approved mastic, sealant, or duct tape (sold separately)
  • Perfect for residential and commercial HVAC installations requiring precise airflow control
Current price is $37.99
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