Achieve Energy Efficiency With 80/20 Direct Fired Make-Up Air Units

November 8, 2023

Heating a commercial or industrial space can be costly, so as the seasons change owners and facility managers naturally consider ways to minimize this cost. Investing in an 80/20 direct fired make-up air heater should be high on their list.

KEES Model DFG units with the 80/20 option are extremely efficient. The direct-fired heater in each of these units provides 100% combustion efficiency. The 80/20 option allows the unit to recirculate up to 80% of the air volume from the indoor space. Warming this air to the desired temperature requires much less energy than bringing 100% cold outside air up to temperature.

KEES Unit Tames a Tornado

One recent project, the Howlin’ Tornado Water Slide at Great Wolf Lodge, features a KEES make-up air unit that works behind the scenes to keep the air fresh, safe and comfortable for the occupants of the indoor waterpark. For the water park project, the lodge needed a reliable, energy-efficient make-up air unit that came with an independent certification and with on-site training. The result? KEES provided this iconic Wisconsin Dells resort with a unit that moves 17,000 CFM of clean, filtered air.

Wisconsin Dells resort with a unit that moves 17,000 CFM of clean, filtered air.

Precise Controls Ensure Clean Combustion

Recirculating air sounds like a simple concept, but when combined with a direct fired burner, recirculation requires specialized controls. Because the combustion occurs directly in the airstream, ensuring clean combustion is very important. KEES Model DFG make-up air units have clean combustion thanks to a precise control system. ETL has independently tested our units and verified they meet the stringent requirements of ANSI standard Z83.18 for recirculating direct gas-fired heating applications.

Achieving Optimal Efficiency In Large Spaces

Ideal applications for 80/20 DFG make-up air units include industrial and production buildings, warehouses and maintenance facilities for vehicles, trains and aircraft. The 80/20 units can also help control building air pressure. Additionally, they can be used for a wide range of make-up air and/or space-heating applications.

KEES 80/20 DFG Make-Up Air Unit Features

ETL listed in accordance with the stringent requirements of ANSI standard Z83.18
FM and IRI compliant
Airflow capacity up to 30,000 CFM
90-degree maximum temperature rise
Switch to 100 percent outside air when maximum ventilation is required
Outdoor or indoor installation
Vertical or horizontal mounting
Optional stainless steel construction or Heresite coating for harsh operating environments

View and download the submittal

*KEES 80/20 make-up air units can be mounted vertically or horizontally (as shown above), and have many other options and accessories.*

FULL LINE OF AIR HANDLING SOLUTIONS

In addition to 80/20 DFG units, KEES manufactures numerous air-handling units to offer comprehensive solutions for all your air distribution needs with these advantages:

Durable, high-performance motors, fans, dampers and electronic controls
100 percent thermally efficient heaters for maximum energy conservation
Customized electronic controls including interfaces for building management systems
Easy servicing with removable panels on both sides on every section, generous spacing between components, numbered terminal strips and wiring raceways.
Optional stainless steel construction for harsh operating environments
Full line of accessories enables customized solutions

Learn more about KEES make-up air units