This Master Flow 6-inch starting collarGo to product viewer dialog for this item. features a snap-together design for efficient HVAC installations. Constructed from durable 30-gauge galvanized steel, it serves as a transition from flat surfaces like plenums or duct boards to round pipe and insulated flexible ducts. The collar includes a 2-inch space between the bead and flange for secure duct attachment and is compatible with both lined and unlined metal surfaces

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