Content Container Nailor Round Industrial Control and Isolation Dampers are designed to provide tight shutoff with very low leakage in HVAC or industrial process control systems. A variety of optional features allow them to be tailored to the application. Models 1989 - Light Duty • Steel • Round 1990 - Steel • Round 1995 - Steel • Round • Isolation Damper Submittals All Submittals Combined Individual Submittals 1989 • Steel • Round • Light Duty 1990 • Steel • Round • Butterfly Blade 1995 • Steel • Round • Isolation Damper Options and Accessories BH1 & BH2 • Bolt Hole Configurations for 1900 Series Industrial Dampers Videos