I have 4 year old furnace with evaporator in the attic and a newly installed condenser but the A coil is a vertical unit turned sideways so it does not have a proper drain pan. It needs a 21" square stainless pan with a drain pipe to the pump. Looks like you will need to find or fabricate this pan, open the plenum side and top to lift the coil, and insert the pan under the coil. coil is American Standard 4FXCB042AC3CAB outside dim 22.63" x 21.5" x 17.5"
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