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I thought most units had a recirculation ability?
Mine has a lever on the control panel...I think it is up for outside air mix, and down for recirculate. We usually leave it down to force humidity out of the air and not bring in outside air.
I just know on the inside filters on the bottom of the unit, you can feel much more draw on them with the lever in the down position. And, the sound is different. Sort of like the difference in regular and max/recirculate in a car...you can tell when you have it on recirculate.
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