ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,976, issued on Jan. 13, was assigned to Tyco Fire & Security GmbH (Neuhausen am Rheinfall, Switzerland).

"Systems and methods for combined outdoor air fraction and VAV unit control" was invented by Anas W. I. Alanqar (Milwaukee), Michael J. Wenzel (Grafton, Wis.), Jon Douglas (Mequon, Wis.) and Fang Du (Milwaukee).

According to the abstract* released by the U.S. Patent & Trademark Office: "An control method includes obtaining measurements of a carbon dioxide (CO2) level of a zone and a temperature of the zone. The method includes determining, based on the CO2 level of the zone and the temperature of the zone, a combination if (i) control decisions for an air handling unit (AHU) a...