A new Center for Disease Control and Prevention (CDC) study involving 196 cooling towers nationwide found that 84% contained Legionella DNA, indicating that the dangerous bacteria was present or had been at some point.
All outside air isn’t created equal, neither is the available engineering guidance, and there isn’t enough preliminary owner/consultant discussion about the pros and cons. Welcome to the air filtration design process.
A Tennessee district faced an old school HVAC challenge: aging ventilators and space constraints. So this team tried a new-school variation on common VRF retrofits to deliver improved efficiency and critical IAQ: they decentralized the outdoor air, combining enthalpy wheel and VRF components within a single classroom enclosure.