Ceco's Sound Tech System is designed for mid-range and high-range sound intensity attenuation. Sound Tech's affordable cost and prompt availability encourage use in a wide range of applications, including those where custom sound doors might be considered cost-prohibitive. With acoustical ratings from STC 39 to STC 52, Sound Tech provides cost effective performance with standard 1-3/4" thick door appearance and function. 1-3/4" Ceco Sound Tech doors are available in single or double swing with astragal seal. Doors are furnished prepared for Cylindrical or Mortise Locks, optional acoustical glazing is available up to 300 sq. inches. Sound Tech is complete with welded frame, perimeter gaskets, door bottom seal and threshold. System utilizes heavy weight butt hinges. (Cam lift-type hinges are not required.)