Plenum Take-Offs For Use With Square Fiberboard Duct Go to amazon.com Related posts Check expert advices for duct board square tool? FeatureItem-Plenum Take-OffsType-Square Fiberboard DuctDescription-Plenum Take-Off KitsFor Use With-Square Fiberboard DuctPackage Quantity-2 DescriptionPlenum Take-Offs For Use With Square Fiberboard Duct