I bought the service manual for this dryer partly to answer this question. The answer is no, it can not operate without a vent. Air is drawn in from the laundry room and blown out the vent in all modes of operation. I expect that vented air will be humid even when run in Eco mode. Ventless dryers would recirculate the humid air repeatedly until all water condensed out of it into the drain pan, but this dryer wasn't designed to do that in any mode. If you vent it into your laundry room, you will eventually get mold growing in the walls due to the water in the vented air.
Date published: 2017-07-10