Outside Air Management

Continuous air replacement leads to energy waste, but air scrubbing can reduce the need for outside air.

With standard HVAC systems, all of the air in a building is replaced every 1-2 hours. In some buildings, that means 20 times the entire volume of the building’s air capacity passes through the building every day. That air doesn’t enter the building at room temperature, so vast amounts of energy is wasted heating or cooling the air to a comfortable level. To reduce this waste, buildings can use HVAC Load Reduction (HLR®) modules to scrub the indoor air to maintain indoor air quality. When doing this, the building can use less outside air changes – creating a huge energy saving.

Typically, 60-80% of outside air brought in by traditional air replacement systems can be eliminated by HLR® technology, saving heating or cooling energy. Enough air still needs to be brought into the building to maintain positive pressure and make up for mandated building exhaust from bathrooms, but this is a much lower number of outside air changes than without HLR modules.

In environments where the outside air is polluted, whether due to temporary spikes or permanently, the substantial reduction in outside air also reduces the outside contamination loads on the building and the HVAC filtration systems. This enables further cost savings by reducing the frequency of filter replacement.

Furthermore, studies show that bringing outdoor air pollution into a building can be hazardous for both health and productivity. One study from Tufts University found that people living near the polluted air coming off a highway had a higher risk of cardiovascular disease. A study by the National Bureau of Economic Research found that urban pollutants from outside air lowered the productivity of workers.

Latest Blog Posts

ASHRAE’s Updated Commercial Guide Recommends High-Efficiency Filtration for COVID-19

Until recently the guidance for mitigating airborne virus spread has largely focused on maximizing outside air (OA) ventilation. For months, […]

6 Frequently Asked Questions about Airborne Transmission of COVID-19

Bioaerosols, High Efficiency Filtration & Outside Air Ventilation 1. What are the current recommendations on airborne transmission of COVID-19? There [...]

HVAC Design to Mitigate COVID-19: More Filtration, Not Ventilation in Commercial Buildings

While it has yet to be definitively demonstrated that aerosolized SARS-CoV-2, the virus behind COVID-19, can be transmitted through HVAC [...]

Indoor Air Quality

Indoor air quality (IAQ) is the air quality within and around buildings and structures. IAQ is known to affect the health, comfort and well-being of building […]