Lennox X6661 HCC20-28 Healthy Climate HC16 Cabinet 21" x 28.5" x 5" Actual Dimensions: 21" x 28.5" x 7" Cabinet will withstand 400 lbs. static weight, enough to support the weight of a typical furnace and indoor coil or air handler. No additional energy costs Tool-less access door allows quick and easy replacement of filter media. Mounts in any position. Air flow direction through the cabinet can be changed by repositioning the filter. Arrows on filter indicate air flow direction. Cabinet is shipped compact and requires minimum field assembly. No tools required.