The original wick filter had a metal strip to hold it upright. The WF813 replacement has no strip and when the wick is wet it falls down the chute exposing the rear grille of the humidifier housing and allowing air through the top of the wick. Maybe I bought the wrong one. Despite the 1 inch gap, the humidifier still blows moisture into my bedroom and I have to say this humidifier is the best of the five I've bought.
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