Overview Index Offer Welded Duct In Black Steel For Special Application For CommercialsKitchen Extract And Smoke Extract Application ,These Ducts Are Manufactured FromVarious Thickness Up To 4 Mm In Rectangular And Up To 3Mm In Round Duct HavingLongitudinal And Transverse Connection With Fully Welded Water Tight Joints. EndConnection Are Flange Steel Angle Welded In Duct Body Catalog Black Steel Leave a comment Cancel reply Save my name, email, and website in this browser for the next time I comment. Send Comment