Affordable carrels with high side panels provide a private work area for studying or computer users. A 7 7/8"D shelf is located above the work surface, which is 30"D. Removing this shelf provides ample space for a large computer monitor. The work surface adjusts 27"H to 29"H to accommodate a variety of users. Adder units cannot stand alone, having only one end panel. A base unit must be ordered first, then adders included as desired to build a group of carrels.