The humidifier includes a cabinet having a rear wall, a front wall, a pair of side walls, a bottom wall and a sump defined in part by the walls at the bottom of the cabinet. The cabinet has in the interior thereof means providing communication with an air system. Retainer ears are provided on the outer surfaces of the side walls near the top thereof. An evaporator pad is mounted in the cabinet adjacent and parallel to the rear wall. A water distribution trough is disposed in the interior of the cabinet adjacent the rear wall and is located above the evaporator pad for providing a substantially uniformly distributed flow of water to the evaporator pad. A pair of mounting elements are provided on the inner surfaces of the side walls near the bottom thereof. A swingable cover is provided for opening and closing the cabinet and has a top end and a bottom end. The cover at the bottom end is provided with a pair of bearing portions which are engageable with and pivotally mounted on the mounting elements. Fastening means are secured to the sides of the top end of the cover and are engageable with the retainer ears when the cabinet is closed. The cover when the fastening means are disengaged from the retainer ears being swingable relative to the mounting elements for opening the cover to permit access to the evaporator pad and to the interior of the cabinet.
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