What are the corresponding R. H. per centages to the control positions (e.g., "on" thru Max). While the higher capacity models (retained water holding volume) have a LCD lighted "screen" for selecting R. H. level desired, this unit (that uses an almost exact operators manual) has only designated positions (6). What would the Relative Humidity be before this unit would shut off at each of these settings? Likewise, does this unit run continually on "Max" regardless of humidity reduction?