Cleaned & checked 3 condensing gas furnaces. Inspected heat exchanger & flue venting. cleaned burners & flame sensor. Checked voltage & amp draw of motors. Test capacitors. Main system: cleaned electronic air cleaner. Clean and check humidifier, replace pad, checked water flow and drain. Blower: 4.5/5.8A . Inducer: 0.34/.056A . Gas pressure: 1.8/3.5inches water column. MBR: Cleaned electronic air cleaner. Clean and check humidifier, replace pad, checked water flow and drain. Blower: 2.0/3.1A. Inducer: 0.34/0.56A . Gas pressure: 1.9/3.6 inches water column. Second floor system: cleaned filter. Blower: 4.1A . Inducer: .62A . Gas pressure: 1.8/3.5 inches water column.