So it actually does NOT fit the Vicks VEV400 humidifier as stated in the question and answer so this model seems to be no longer marketable as I couldn't find replacement filters anywhere. The machine says it needs type PWF2. Very frustrating. I had to cut the filter with a pair of scissors and push it in pretty hard and I used it that way. In addition, the filter yellowed quite quickly at the edges, in 2 days. Vicks should stop selling this humidifier because nobody offers a filter for it.
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