29x32x1 air cleaner I performed a clean and tune up on the geo unit. Found the capacitor was weak, the contactor was building up resistance in its contacts and the drain was plugged. I replaced the capacitor, contactor and drain line. I cleaned the air coil with a foaming cleaner. I also installed an electrostatic filter and wired it to the geo unit. Cycle the unit, tested heat of extraction. Had 43650 btus which is good. All my reading were matching the manual specs. Geo unit is operating properly. 15gpm x 485x6=43650 btu