Integrated Zone System Zoning Assembly, Contains The Basic Control Components (Excluding Wall Mounted Sensors) For Either A 3 Zone Or 2 Zone System With By-Pass. Includes: (1)Enclosure, (1)System Controller, (1)Expander Board, (3)Zone /Bypass Control Cards One For Each Zone Plus One For Modulated Bypass, (1)Discharge Air Temperature Sensor, Dims:4-3/4"H X 10-3/4"W X 20-1/2"D, Weight: 11 Lbs