Air curtains discharge a steady stream of air toward the threshold of an open doorway to separate indoor and outdoor conditions. Aside from helping to keep out the cold or heat, they are also useful in controlling infiltrations of dust and flying insects. Typically mounted inside and atop a doorway, these HVAC components are intended to curb energy losses from openings, and improve indoor air comfort.

Millions of Canadians swim in tens of thousands of natatoriums across the country, but many may be unknowingly exposed to risks related to poor indoor air quality (IAQ). As the pool industry has matured, the knowledge base regarding how to properly design, maintain, and control these spaces has improved, but several challenges persist or have become even more critical.