ASHRAE's Building Readiness Team recommends verification of ventilation control and encourages increasing outdoor ventilation rates. Many schools and restaurants are heated and cooled with small packaged systems (≤15 tons). Our duct or hood mounted thermal dispersion airflow measurement probes are perfect for retrofit on existing HVAC equipment with or without economizers or B.A.S. They easily integrate with existing thermostats to control outdoor ventilation rates. GreenTrol Automation, Inc. * 156 Holly View Lane, Loris, SC 29569 * Toll Free: 877 4GNTROL (446 8765) * Internet: GreenTrol.comhttp://www.GreenTrol.com