Zone Panel, Overall Height 8 1/8 in, Overall Width 8 in, Requires Thermostat Type 1 Cool, 1 Heat, Terminal Designations C, G, M1, M4, M6, R, RC, W, Y, Number of Zones 3, Housing Color Gray, Product Type Zone Panel, Nameplate Voltage 24V AC, Includes AT140A1042 40 VA Transformer, AT175A1008 75 VA Transformer, DATS C7735A1000 Discharge Air Temperature Sensor (DATS), Slave Damper Control Relay, Minimum Ambient Temperature -40 Degrees F, Maximum Ambient Temperature 165 Degrees F