Though with a sleek design. Wine Guardian’s through-the-wall (TTW) wine cellar cooling units will match the unique style of today’s modern wine cellar. In addition, it is available in two sizes. Our TTW cooling units are perfect. For small- to mid-sized cellars. Accordingly, our innovative through-the-wall systems offer exceptional airflow. Helpful to maintain optimal temperature and humidity. Moreover all with the quietest operation in their class.