Industrial Louver Dampers
Types of Louver Dampers
Parallel Louvers Dampers
Parallel louver dampers are primarily used for isolation applications. All of the blades rotate in the same direction. With the addition of blade seals, this damper can achieve better than 99% shut off. Parallel blade louvers are also used on inlet boxes of large industrial fans to promote pre-spin to the in rushing air, thus enhancing fan performance.
Opposed Louvers Dampers
Opposed louver dampers are used for process gas control. The louvers function by rotating adjacent blades in opposite directions. (One clockwise, the next blade counterclockwise) Operating the blades in this manner gradually decreases or increases the cross-sectional area between the blades during operation. This gradual change in area allows this louver to have reasonably good air control features.
Double Louver Dampers
Double louver dampers are designed to achieve zero leakage isolation. Double louvers achieve zero leakage isolation by pressurizing the space between the two sets of louver blades with “seal air”. This “seal air” is supplied at a pressure higher than the pressure in the flue duct, creating a positive pressure environment.
Tandem Louvers Dampers
Tandem dampers are designed to perform as a Double Louver Damper except instead of having “seal air” between two sets of louver blades, the “seal air” is between the two skins of the wider tandem blades. The advantage is a more compact design as well as fewer blades, bearings, shafts, etc.
For Isolation & Flow Control
Fox Equipment designs and manufactures heavy-duty industrial louver dampers engineered for both precise flow control and 100% zero-leak isolation in flue gas and air systems. As a single-source supplier, we deliver fully integrated systems from louver dampers and ductwork to expansion joints and stack connections. Since 2003, we’ve built solutions that last 20+ years in the field.
Clients, including TVA, Babcock Power, Tesla, and Ford rely on us for fast turnaround, superior craftsmanship, and equipment that exceeds performance standards.
Trusted By
Why Choose Fox Equipment Louver Dampers
Single-Source Turnkey Supply
We deliver louvers, ducts, expansion joints, and stacks all engineered together
Zero-Leak Isolation
Double and tandem louvers with seal-air pressurization for 100% shutoff
Built to Last 20+ Years
Heavy-duty materials and design reduce need for replacements or spares
Rapid Customer Support
We respond to every client within 24 hours
Installed by Global Leaders
Our dampers operate in facilities for TVA, AMEC Foster Wheeler, Rentech, LG&E, JEA, and more
Ownership Approach
We build every damper as if it were going in our own plant
Industrial Louver Damper Images:
Typical Applications
Fox louver dampers are used in systems requiring durable, high-performance air or gas isolation and control:
Flue Gas Desulfurization (FGD)
Combined Heat & Power (CHP) Systems
Fan Pre-Spin Inlet Boxes
SCR & Emissions Control Systems
Turbine Exhaust Ducts & HRSG Systems
Chemical & Process Plant Ducting
Proven Performance & ROI
Zero-Leak = Zero Fines
100% shutoff ensures clean emissions and avoids EPA penalties
Fewer Failures, Less Downtime
Compared to competitors who require replacements every 6 months, Fox dampers operate trouble-free for decades
Long-Term ROI
Reduced replacement frequency, fewer spare parts, and less downtime save thousands per unit
Example: A client replaced a competitor’s damper every 3 months. Fox’s replacement lasted over 2 years — cutting downtime and maintenance costs dramatically.
Over 50 Years of Excellence
Manufacturing, Materials & Integration
In-House Fabrication – Built in the USA by Fox Equipment’s experienced team
Heavy-Duty Alloys & Components – Materials rated for high-temp, high-pressure environments
Complete System Integration – Our dampers mount directly to duct systems, stacks, and are delivered with compatible expansion joints
Open Door Policy – Clients are welcome to visit and inspect our shop, anytime
Frequently Asked Questions (FAQs)
What’s the difference between parallel and opposed louver dampers?
Parallel louvers are mainly for isolation; opposed louvers are for modulating airflow.
What is a double louver damper?
It’s a damper with two blade sets and a pressurized middle zone (“seal air”) to block any leakage, ideal for scrubber systems.
How long do Fox louver dampers last?
Our dampers are designed to operate 20+ years with minimal maintenance — far outlasting most competitors.
What industries use louver dampers?
Power generation, chemical processing, emissions control, and any facility managing flue or exhaust gases.
Can your dampers integrate with expansion joints and stacks?
Yes, Fox is a single-source provider and we integrate louvers with ductwork, joints, and stack systems for seamless installation.
Request a Quote or Speak with an Engineer
Let us help you design the right louver damper system for your application. Request a Quote or Contact Fox Equipment today.