Industrial Louver Dampers

For Isolation & Flow Control

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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.

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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

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.

Industrial Louver Damper Images:

Fox Equipment Louver Damper
Fox Equipment Louver Damper
Fox Equipment Louver Damper
Fox Equipment Louver Damper
Fox Equipment Louver Damper
Fox Equipment Louver Damper
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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

Fox Equipment 2023 - Celebrating 20 Years

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

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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.