Galvanized Ductboard Straight Spin-In's - No Damper #1000 SKU 1004 Please select 4" DUCT-BD SPIN IN 75/CTN 5" DUCT-BD SPIN-IN 36/CTN 6" DUCT-BD SPIN-IN 32/CTN 7" DUCT-BD SPIN-IN 24/CTN 8" DUCT-BD SPIN-IN 20/CTN 9" DUCT-BD SPIN-IN 15/CTN 10" DUCT-BD SPIN-IN 14/CTN 12" DUCT-BD SPIN-IN 9/CTN 14" DUCT-BD SPIN-IN 6/CTN 16" DUCT-BD SPIN-IN 6/CTN 18" DUCT-BD SPIN-IN 4/CTN 20" DUCT-BD SPIN-IN 4/CTN Log in to view price