5" Duct Board Start Collar - For R4-R6 (1"-1.5") Duct Board, Optional Damper Holes

68988 MFG #: 5515
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Knock-Out Holes for Damper Installation; Factory Assembled
Duct Collar; Type Start, Assembled; Size 5"; Material Thickness 30 Gauge; Material ASTM A653 B Galvanized Steel; Inclusions/Features 1" Outside Ring, Knockout Hole; Used On R4.2 and R6 Ductboard; Packaging Quantity 12 per Box