About Us

This site and its content is a free resource brought to you by the thought leaders within Madison Industries’ Indoor Air Quality group of companies. We are dedicated to sharing knowledge about indoor air quality that can help people breathe easy every day.

Our companies specialize in technologies that help deliver clean air for people around the world. Our products work together to purify the air we breathe by removing pollutants, managing humidity, bringing fresh outside air to indoor spaces and cleaning recirculated indoor air. Because every breath matters.


With over eight generations of Dedicated Outdoor Air (DOAS) products, Addison continues to lead the industry in product development. From its highly configurable PR Series, modular split MA/MC series, and the all new compact AK Series, Addison offers ultimate performance configured for customer applications.


Airxchange is the leading manufacturer of Energy Recovery Ventilation Components in North America. Our company’s mission is to design and manufacture high quality products that perform reliably and effectively for the life of the HVAC system, reduce energy consumption, and improve indoor air quality.

Big Ass Fans started by creating safer, more productive work environments in industrial facilities. But we didn’t stop there. Proven by our products’ performance, what started as a big idea became a workplace revolution and is now best practice for designers, managers, and business owners across every imaginable industry and application. Go to work, hit the gym, or enjoy a night on the town and chances are you’ll see a Big Ass fan [overhead] keeping the peace smoothly and silently. From factories to homes and everywhere in between, Big Ass fans deliver comfort, style, and energy savings that make life and work more enjoyable.

Broan-NuTone products can be found in more than 110 million homes across the United States under Broan-NuTone, Broan, NuTone and BEST Range Hoods brand names. Our products help builders, remodelers, contractors, designers, and architects build and update homes’ ventilation systems while providing added features like antimicrobial LED lights, humidity and heat sensors, smart motors, and cloud-connected automated indoor air quality. We also offer a wide selection of products that help meet the requirements of all three major green building programs: ENERGY STAR®; U.S. Green Building Council’s (USGBC) Leadership in Energy and Environmental Design (LEED) for Homes; and the National Association of Home Builder’s (NAHB) Model Green Home Building Guidelines.

When keeping patients safe is a priority, creating healthy environments is critical. CLEANSUITE systems hang directly above the patient table in an operating room and remove airborne particles and contaminants from the patient area while bathing the patient in HEPA-filtered air.

Filtration Group Indoor Air Quality

FG IAQ is one of the largest air filter manufacturers in North America, servicing industrial, commercial, healthcare and government institutions, producing millions of filters each year.

Frame-Tec, a division of NovelAire, is the exclusive North American distributor of Pro-Lam Alluminio EUR-1 modular frame systems of extruded aluminum profiles, connectors, and other accessories. Used for commercial HVAC construction, prototyping, housing applications, and more fabrication projects. Dream. Design. Build.

Since 1919, Intertherm has been an integral part of improving the comfort of manufactured homes. From the first generation of manufactured housing heaters to the next generation of efficient furnaces, Intertherm sets the bar high for innovation and continuously pushes the industry forward.

Since 1919, Miller HVAC products have brought comfort to manufactured homes. Miller products are built with care to keep turnaround time low and quality level high. Each system is inspected more than 200 times during production.

Nortek Air Solutions has engineered over 11 million square feet of cleanroom systems that exceed strict contaminant- and particulate-free regulations to keep the world’s most innovative spaces running. From pharmaceuticals to the chips that power phones and laptops, CleanPak systems bring clean air to critical applications for a clear path to innovation.

Governair has been an industry leader in the design and manufacture of HVAC systems since its founding in 1937. The brand was one of the first companies to pursue a total-system approach for climatizing a large structure, and it left its defining mark on the industry in 1942 by patenting the first self-contained, water-cooled air conditioning unit ever built for commercial use. Today, the commercial and industrial air handlers manufactured by Governair continue its legacy.

Nortek Air Solutions Huntair develops new technologies that solve customers’ most difficult challenges. From conventional systems to mission-critical applications, Huntair products are customized to meet the efficiency, IAQ, power, airflow, filtration, redundancy and maintainability needs of each application.

Nortek Air Solutions is committed to finding the best and most economical solutions for the entire lifecycle of the facilities its products serve. Mammoth products meet and exceed the indoor environmental needs of new construction, renovation and system upgrade projects. Products are custom built to meet small footprints, achieve low sound requirements, operate at peak efficiency and filtration standards, and provide multiple levels of redundancy; all concealed within the building design.

Nortek Air Solutions Venmar produces cost-effective, energy-efficient, energy recovery packaged direct expansion (DX) solutions for the commercial ventilation market. It is committed to preserving the environment through exhaust air energy recovery and by recycling waste energy and using it to precondition outdoor air. This significantly reduces the heating, cooling and humidification loads required to maintain proper levels of temperature and humidity within an occupied space.

Nortek Air Solutions Ventrol produces custom-designed commercial air handlers with one-of-a-kind features that deliver solutions for retrofit and new construction applications. Ventrol delivers innovative designs engineered to meet the specific demands of any application.

Nortek StatePoint units are the future of sustainable data center cooling. This revolutionary technology offers a complete cooling plant inside a self-contained air handling unit. Its indirect evaporative cooling method uses a unique semi-permeable membrane exchanger that completely separates water from the air stream resulting in significant PUE and WUE savings.


NovelAire is an industry leader in providing energy recovery and desiccant dehumidification wheels manufactured with proprietary media and featuring permanently infused desiccant for lifelong performance. Beyond supplying quality components, we leverage it, and deliver energy efficient dehumidification equipment that is cost competitive and capable of delivering air below 45°F dew points for the North American HVAC market.


Phoenix is the leader in drying and dehumidification equipment including LGR and desiccant dehumidifiers, air movers, air scrubbers, water extraction tools, portable electric heating and cooling systems, hydronic heat, and metering devices. With proven performance and pioneering technology, Phoenix continues to revolutionize the restoration industry.

Phoenix Air Systems

Phoenix Air Systems manufactures Hygienic Air Handlers for critical process applications such as food processing facilities (meat, poultry, seafood, fruits and vegetables, juice, nuts, dairy and eggs, frozen, bakery items and prepared foods). Used in food processing plants, hygienic air handlers control the air delivered to processing, packaging and storage areas.


Purafil is a global leader in gas phase air filtration systems and engineered solutions designed to protect people, processes, and environments. The company’s products set industry standards.

Rapid Engineering

Rapid Engineering LLC manufactures industrial-grade make-up air solutions for the rigors of industrial & commercial applications. Our history and expertise in enhanced heavy-duty welded cabinet construction and features shows through all of our models. RAPID has earned a reputation for tough make-up air units built to last.

Reznor brings big innovation to light commercial applications through continuous engineering improvements that make installation easier, efficiency better and air quality safer. From dedicated outdoor air systems to unit heaters, Reznor offers complete solutions for workspaces, garages, small businesses and much more.

Santa Fe

When it comes to protecting your family and property from the harmful effects of excessive moisture, you should never settle for anything but a Santa Fe or Ultra Aire by Santa Fe. That’s because we take great pride in engineering products that set the standard in dehumidification for the entire home. It’s not only our mission, it’s our passion. Manufactured in Madison, Wisconsin, our dehumidifiers are commercial-grade, easy to install and feature unparalleled air filtration — giving you peace of mind in knowing that the air circulating throughout your home is clean, pure and safe. 

Steril-Aire logo

Our science is groundbreaking. But our goal is simple: Continue to produce innovative, technological solutions, backed by science, that enhance our customer’s image, save money and create a better environment to live, work and breathe. Steril-Aire, ISO Certified in both 9001:2015 & 14001:2015, launched UVC for HVAC industry in 1994 and remains at the pinnacle today. Steril-Aire is the unrivaled leader in the development of high performance UVC solutions for air and surface decontamination.

united coolair

Founded in 1988, United CoolAir manufactures 2 to 100 ton “All-Indoor” modular, packaged HVAC systems for commercial & industrial cooling, as well as 100% Dedicated outdoor Air Systems. Horizontal and vertical units are sold as air-cooled, water-cooled, and heat pump models with additional options to accomplish many replacement installations. United CoolAir also produces 5 to 30-ton portable, temporary environmental control HVAC units under the name Therm~Air.

We are the market leader in UVC Disinfection and HVAC Efficiency. Our germicidal UVC solutions disinfect airstreams, mitigate disease transmission, and inactivate microbial contaminants that impede HVAC performance. Nearly 25 years ago, our founders pioneered the application of UVC energy in HVAC equipment, helping establish ultraviolet air and surface treatment as a mainstream technology. Today, we supply market leading germicidal UVC solutions to building engineers, facility managers, HVAC/R contractors and OEM equipment manufacturers around the world.