Nailor Design 0722 Ceiling Dampers are for use in round applications, in lieu of hinged doorway variety dampers in any UL/ULC floor/ceiling or roof/ceiling assembly with approximately a 3 hour fire resistance ranking where air ducts are authorized. Industrial dampers use a heavy-duty flanged body damper with various blade models and tension lessons. These https://israelyqesg.azzablog.com/37310761/everything-about-dampers-for-industrial-sector