DCA offers Dehumidifiers in two basic air flow configurations, horizontal and vertical. Each has its advantages and normally the size of the equipment room and/or the orientation of the ductwork dictates which is preferred especially if this is a replacement dehumidifier.
Normally a horizontal dehumidifier replaces an existing horizontal dehumidifier and the same is true for a vertical dehumidifier.
In general a vertical dehumidifier normally sits on the floor and has a slightly smaller footprint, than a horizontal dehumidifier, but is much taller. A horizontal dehumidifier can set on the floor or be suspended in a mechanical room. Horizontal dehumidifiers also have the advantage of having the discharge air flow configured to be straight thru, bottom or top.