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EFM Dampers,Expansion Joints


Effox-Flextor-Mader (EFM) is the international leader in the design and manufacture of  dampers and expansion joints for use in flue gas and process air handling systems.  Our team includes a skilled staff of engineers, designers, fabricators, and field service personnel to ensure the highest quality engineered-to-order products.

Around the globe, our dampers and expansion joints are being used in systems that clean polluting emissions and contribute to reducing greenhouse gases. We are known for our commitment to quality. We offer engineered-to-order solutions that meet the most demanding specifications for the world’s most stringent customers.

For machinery operations, EFM offers MADER DAMPERS® for use on boilers, furnaces and incinerators as well as fans and air pollution control equipment. 


Quality Products

  • Dampers and Expansion Joints
  • Engineered-to-order products
  • High value; low total cost
  • Portfolio of products for full system integration

Extensive Capacity

  • 145,000 SQFT (13,475 SQM ) captive shops in the USA
  • Experienced global fabrication partners


  • All EFM fabrication is performed according to strict Quality Control procedures.
  • EFM offers in-house, non-destructive testing using approved and certified testing methodology. Our in-house quality control staff includes full-time certified welding inspectors (CWI) and NACE certified finishing services.

Experienced Professionals

  • On time deliveries
  • Practical installation and maintenance manuals
  • Global start-up technicians
  • Spare parts and service support
  • Turnkey installation available



For the last four decades, the Effox-Flextor-Mader brand has become a world leader in the innovation and creation of state-of-the-art, adaptable fuel combustion and exhaust equipment. To face the high temperatures and harsh environments found in solid fuel combustion, it is absolutely crucial that you have access to equipment that is reliable, durable, and safe. Around the world, Effox-Flextor-Mader dampers and expansion joints give companies the hardware they need to curb greenhouse gas emissions and other pollutants that are destructive to our air and threaten our wellbeing. We work hard to contribute a strong and healthy environment.

Effox-Flextor-Mader brand a global leader in the industry for decades. Safe, durable, and reliable equipment is absolutely essential when facing the extreme temperatures and harsh environment of solid fuel combustion.

As you work to control emissions, you can trust we are working just as hard for your company. Protecting the environment is a commitment for Effox-Flextor-Mader that is matched only by our commitment to building quality equipment for our clients. From start to finish, we craft and install products that are unparalleled in value and reliability and can comply with the strictest regulations in the industry. When you need a custom, specific solution for emissions, we can meet your needs. Our staff of engineers includes some of the industry’s best, and they are eager to help you find the ideal solution for your company. When you choose Effox-Flextor-Mader, you are choosing a product for life.


With over 35 years of experience, Effox-Flextor-Mader offers time tested robust dampers to achieve a 20+ year low maintenance design life. Constructed with carbon steel, stainless steel, alloy, and/or corrosion resistant  materials our dampers are capable of withstanding  temperatures up to 1800°F (982°C) and the most  chemically punishing environments. Our engineering and  design team is involved with every project to ensure the  structural and dynamic integrity of our products.



Effox-Flextor-Mader is the recognized leader in providing non-metallic expansion joints to the utility and industrial markets around the world. With custom engineered designs for each application, Effox-Flextor-Mader has provided reliable flexible solutions for service from -40°F to 2100°F (-40°C to 1149°C). Our EFLEX™ expansion joints reflect the highest engineering standards and professional workmanship in the power generation and heavy industrial market. The Effox-Flextor-Mader team provides customer service and technical support from project inception to completion.




9759 Inter Ocean Dr.
Cincinnati, OH 45246

[email protected]



2520 Boulevard des Entreprises, Suite 109 Terrebonne, QC. J6X 4J8

[email protected]



422 Commerce Drive East
LaGrange, OH 44050

[email protected]


New Acquisition: General Rubber

We are pleased to announce General Rubber was acquired by CECO Environmental and will be integrated into the Effox-Flextor-Mader business segment. The combined product offering of CECO, General Rubber and Effox-Flextor-Mader will significantly enhance business efforts to protect people, the environment, and industrial equipment across its existing offerings of EFM dampers and metallic expansion joints to include rubber expansion joints, ducting expansion joints, and industrial pinch and duck bill valves.