VIRTUAL WALL® is a hybrid HVAC system that provides indoor air, filtration air purification & focused heating for mixed use industrial spaces. In occupied areas, TARGETED ZONE HEATING is needed to achieve optimal worker comfort. Unitary air heaters are commonly used for zone heating. But in open areas, heated air will spread, allowing heat to dissipate. Heat is then inefficiently lost to the rest of the building & storage areas where it's not needed. Infrared heaters keep comfortable RADIANT HEAT focused in occupied areas, directing infrared heat exactly within the space, without requiring walls to contain the heat. In essence, creating "VIRTUAL WALLS" in open areas where zone heating is needed. ROBERTS GORDON® HIGH EFFICIENCY INFRARED HEATING SYSTEMS can save 40% on energy consumption over conventional air heaters & keep heat where needed. Occupants are warm, even when overhead doors are open. Infrared heaters warm people, floors & surrounding objects, NOT the air, so workers feel warm, EVEN at lower air temperatures. MAKE-UP AIR HANDLERS efficiently address fresh air requirements & improve indoor air quality by providing building ventilation plus heating. Air handlers displace carbon monoxide & carbon dioxide & significantly reduce the spread of airborne pathogens, while satisfying ventilation codes. Elevated outdoor air ventilation rates also prohibit virus, bacteria and mold reproduction. If heating an entire space to one temperature is not desired, MAKE-UP AIR HANDLERS can be used to improve indoor air quality, provide outdoor air ventilation & provide a base-level of heating. This allows unoccupied areas to have a neutral temperature without energy waste. Leading agencies such as the American Society of Heating Refrigeration Air Conditioning Engineers (ASHRAE) & the World Health Organization (WHO) have all recommended increased fresh air ventilation to increase indoor air quality of buildings.