K&B Duct makes dust collection easy. All components for ductwork clamp together using the lifetime-guaranteed "Forever Clamp." K&B Duct is an infinitely adjustable and modular ductwork system. Full factory support available for duct sizing, layout, design, estimating, even special parts fabrication. Full ductwork systems available to you in a week or less. Sizes from 3" diameter to 24" diameter in galvanized and stainless steel.