What are engineers making time to read? Here is the five-item punch list of the most popular news articles, features, and columns at ESmagazine.com.

1. Ventilation Considerations for VRF Systems

2. WSP USA Announces Key Leadership Changes

3. The Importance of Air Filtration: It’s Not Only Dust

4. Reducing the Environmental Impact of HVAC Systems by Using R-32 Refrigerant

5. Probing the Effectiveness of ANSI/ASRAE/IES Standard 90.1