TBJ offers a variety of duct connection options to meet every ducting requirement. Duct transitions are available from rectangular to round, rectangular to reduced rectangular and rectangular to increased rectangular. Round duct extensions made of rigid stainless steel or flexible stainless steel from 4" O.D. to 10" O.D. are available for tables with round duct connections and rigid rectangular duct extensions are available for all table with a rectangular duct connection.