What is a DOAS System? FAQs About Air Systems

What is a DOAS System

If you are looking for a dedicated ventilation system, explore the range of DOAS (Dedicated Outdoor Air System) available. The global DOAS market was valued at $2737.9 million in 2020. As per projections, the market will reach $4815.2 million in 2027.

The article will look at the DOAS system and help you decide if it is the correct air system for you.

 What is a DOAS System?

The problem with traditional HVAC systems is that they are energy-intensive, do not offer proper clean air distribution, and can have microbial contamination. A DOAS helps solve these problems by providing a 100% dedicated outside air supply.

It consists of two parallel systems, one that delivers outside air ventilation, handling both latent and sensible loads. The other system handles loads generated by indoor processes.

 Who Can Use DOAS?

Any building, store, or commercial space that requires conditioned air can employ a DOAS. For example, DOAS is now being used in schools, offices, restaurants, hospitals, retail stores, and hotels.

 What to Look for in an Air System?

When exploring new air systems for your office or commercial building, consider the below factors.

  • Heating and cooling requirement
  • Energy consumption
  • Buying cost
  • Maintenance cost
  • Ease of use
  • Codes and standards followed
  • Indoor and outdoor air quality.

Does DOAS Provide Humidity and Temperature Control?

Depending on the brand and model you go with, there are adjustable components available that let you tell the system the amount of air needed, temperature, and humidity. The system can then adjust its heating and cooling capacity according to the load.

The result is consistent temperatures throughout the facility. In addition, it eliminates the problem of temperature swings that often comes with single-stage equipment.

Is DOAS Energy-Efficient?

Various studies conducted on the energy and cost performance of DOAS found that the system fared better than other solutions like VAV. Companies saw significant savings in both energy and bills.

DOAS today is designed to save on energy and operative costs. It can deliver high efficiency at part loads with modulating technologies.

What are the Benefits of Using a DOAS?

Some top benefits offered by DOAS are:

  • It provides better temperature and humidity control
  • Reliable and controlled ventilation
  • Improved indoor air quality
  • It helps bring down energy costs
  • Reduced floor space requirement for the equipment.

What Standards Does the DOAS Follow?

When shortlisting DOAS, look at the standards it follows and the certifications it has to its name. For example, standards such as ANSI/AHRI Standard 340/360 – 2007 and ANSI/ASHRAE Standard ANSI/ASHRAE 37 2009.

Then there are certifications like Standard for Safety Heating and Cooling Equipment ANSI/UL 1995, CSA 22.2 no. 236; that addresses the safety requirement of different heating, cooling, and ventilation systems.

Checking these credentials is essential as it lets you know the product has been designed according to the specifications laid out by governing authorities.


A DOAS system is a cost and energy-efficient HVAC solution. Its design of two parallel systems allows for better ventilation, consistent temperature, and improved indoor air quality. The system comes equipped with various components that you can control according to your requirement. Ensure you look at the standards and codes the product follows.

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