Combination Fire/Smoke Dampers Leader Dampers offers solutions to the complex challenges facing today's engineers and contractors with choices of: airfoil blade smoke damper. triple crimped blade smoke damper. airfoil blade combination fire/smoke damper. triple crimped blade combination fire/smoke damper. These dampers are available in class I or II and with 250° F or 350° F ratings. Mounting is approved for either vertical or horizontal installation. Order the T.T.D. accessory package for override ability from a remote control panel. Electric or pneumatic actuators can be specified.