What are the space requirements I need to measure before installing this refrigerator?

You need to measure the height, width, and depth of the opening, including baseboards, molding, tile, and countertop overhang. Allow 2.5" of clearance on the hinge side when installing next to a wall, 1" minimum clearance at the rear for proper air circulation and water/electrical connections, and 3/8" minimum clearance at the sides and top for ease of installation (Page 2).