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Stack Isolation Dampers

Stack Isolation Dampers are designed to provide accurate air flow and isolation at high temperature levels, and reduce the stack effect of a system when offline, protecting ductwork from the elements. Our Effox-Flextor brand Stack Isolation Dampers are engineered for optimal performance and efficiency, and heavy duty operations.

Flows to the stack can be voluminous and present large mechanical challenges. Our heavy-duty design ensures that blades do not flutter, shafts are steady, and they also include a unique pressure relief system that allows for opening of the non-driven blades when pressure build-up occurs. Applying decades of experience, we are able to deliver custom-designed solutions configured for your specific application requirements, providing efficient operations for a long service life.


  • Low Total Cost of Ownership
  • Easy shipment and installation with fully assembled units
  • Custom designs with a variety of blade choices to meet flow control requirements
  • Premium quality materials for reliable performance and maximum life span


  • Blade options for large diameter round dampers include two-blade, four-blade, or multi-blade
  • Blade options for large rectangular stack inlet dampers are configured to meet requirements for flow control
  • Optional features include safety cages that meet OSHA requirements, FlexShock™ shock absorbers, and view ports
  • Insulated blades are available for heat retention applications


Stack Isolation Dampers from Effox-Flextor

With industry experience that spans more than 50 years, the Effox-Flextor brand is a global leader in the conception and execution of the finest, most versatile fuel combustion and exhaust equipment. When facing the severe temperatures and harsh forces associated with solid fuel combustion, safe, durable, and reliable equipment is essential. Locations all over the world employ Effox-Flextor brand Stack Isolation Dampers and other products to curb pollutants, emissions, and greenhouse gases that can damage our air and health. We take pride in its contribution to atmospheric wellness.

Our desire to keep the environment safe is matched only by our desire to provide you with the quality equipment you need to better control emissions. When it comes to good air quality, we share your dedication. We create products that are unparalleled in their standards and durability. From concept to realization, our equipment complies with even the strictest regulations. If you need a custom designed system, we are here to help. Our staff includes some of the most accomplished engineers in the world, that stand ready to provide the perfect solution for your application. When you choose Effox-Flextor, you are choosing a product for life.