HVAC systems bring in outside air to replace inside air in order to maintain indoor air quality.
Air replacement can add up to 20 times the entire building air volume per day in some buildings. The HLR® (HVAC Load Reduction) modules save energy by automatically reducing the intake of outside air by a combination of air cleaning and electromechanical control of dampers on the outside air inlets. Typically 80% or more of the outside air introduced in traditional replacement scenarios can be eliminated by HLR® systems, and a comparable proportion of the associated heating or cooling energy is saved. Even with the reduction of outside air, enough air is brought into the building to maintain positive pressure, and to replace the total air volume at least once a day.
In environments where the outside air is polluted, whether temporarily or permanently, the substantial reduction of outside air has the added benefit of reducing outside contamination loads on the building and the HVAC filtration systems. This enables further cost savings by reducing the frequency of filter replacement and providing an improved indoor environment.