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— ‘plug & play’ packaged solution
Withair® Package Rooftop Make-Up Air systems offer a flexible way to provide treated air for one- to eight-story buildings. Many options and configurations are available to satisfy a wide number of applications. Fresh outside air is mixed with return air from the occupied space and then filtered, conditioned, and supplied back into the building. Conditioning involves cooling, dehumidifying, or heating the air for optimal space comfort. Rooftop units can serve a single zone, or an entire building filled with many zones. Some units can be designed specifically for make-up air, where only outside air is treated and sent to the space. Inverter compressors, beltless ECM fans, and energy recovery solutions make rooftop systems an easy-to-maintain, energy-efficient choice for conditioning any space. Heat produced by natural gas, electricity, hot water, steam, and heat pumps provides reliable heating for spaces with colder seasons and climates.
— Comfortable supply air, higher operating efficiency and quiet operation

Traditional gas fired make up air units typically don't modulate very well and result in large temperature swings of the supply air. They also contribute to global warming by burning fossil fuels and often do not have cooling capacity. The variable output of DC inverter compressor control results in softer starts, load matching resulting in more comfortable supply air, higher operating efficiency and quiet operation.

Our industry partners have been producing HVAC equipment for global markets for nearly 2 decades. Our equipment is designed for and tested in various climate. Offerings from 500 - 7,000 cfm.

— What are Make up Air Units?

Make-up air is designed to “make up” the air in your interior space that has been removed due to process exhaust fans. This type of HVAC solution pulls in fresh, tempered air from outside your building to replace existing air that cannot be recirculated.

A make-up air solution is recommended for buildings where environmental conditions warrant a greater need for ventilation not only to improve the quality of air within the building, but also protect the health of those inside.
— What Problems can Make Up Air Solve?
Standard make-up air units are designed to provide a building with tempered fresh air, both heated and cooled, to offset air that is exhausted by other mechanical means. When the space in a home or building is ventilated and not replenished from another air source, the result is depressurization. Consequently, air from the outside will seep through drafty homes and buildings, or if the space is sealed tight ventilation systems will have difficulty exhausting the air.

Reaching high Indoor Air Quality (IAQ) is the main driver behind the need for make-up air units. Whether it is the removal of contaminants in the air or providing a comfortable temperature, there are many ways to improve IAQ. In most industrial and commercial applications, a make-up air solution is a much more effective method compared to typical ventilation fans at reaching an IAQ that greatly improves the safety and comfort of those inside while also not affecting energy efficiency.
— Commercial & Industrial Make-Up Air Applications

High-bay buildings are some of the easiest types of structures to work with when implementing a make-up air solution. For a high-bay warehouse or distribution center to meet the ASHRAE 62.1 standard and local building codes, the natural infiltration rate of the building is often enough to satisfy the fresh-air requirements during occupied hours. As building envelopes become tighter and more efficient, these buildings may need mechanical ventilation to meet local codes.

But the ventilation considerations do not end there.

Regardless of whether your building relies on natural infiltration or mechanical ventilation, both methods require you to address the temperature of the outdoor air entering the building.

While simple ventilation fans can help provide fresh, comfortable IAQ in buildings in more temperate climates, using unconditioned outdoor air to ventilate a building located in a region with cold winters or hot summers can create uncomfortable temperatures for the workforce. Make-up air systems are ideal for tempering the outside air to improve the comfort and safety of those inside.


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