This hood fits over the front of the cooling unit, and acts as a plenum to capture return air from the wine cellar. The cellar must be located directly below the wine cooling unit. Create two openings in the ceiling of the wine cellar, one (using this hood) for return air and one (below the exhaust fan) for supply air. Other than this, the cold side of 1800 cooling units must never be ducted and they must be installed in a conditioned environment to prevent condensation and damage to the control panel. For this reason, it is also recommended to add the remote control/display panel to eliminate the risk of damage from moisture.