CHICAGO — Ventilation and zoning technology continues to improve, giving consumers more options when it comes to controlling their indoor environment. Several manufacturers were on hand at the 2003 Air-Conditioning, Heating, Refrigerating Exposition (AHR Expo) to display the latest developments.

First, the company recently added a Plenum Temperature Control to its zoning system. According to Aprilaire, the product gives the system more flexibility, accommodating up to four different methods of pressure relief.