Product review (1 stars): After years of use of Best Air it is no longer recommend.  New material & design is a failure.
Updated  1/4/18 It appears Best Air has changed the wick material, as compared to those we have purchased in the past.  To extend life we turn the wick every time we fill the water container.  The present generation draw the water very well but the material is very fragile.  Just touching it when you lift the wick to turn it over causes the material to fall apart - like wet toilet paper.  NOTE WE do not recommend you touch the wick material after original installation.  DO NOT plan on turning this wick.  If there is reliable wick out there priced reasonably, I haven't found it at this time.  There is a definite need for a long life low cost wick.  This wick does have a built in metal center support which helps to keep the shape of the wick. But if you can't turn the wick it appears the additional structural metal center piece is a negative because of the very thin paper wick material falling from the center support.  If you don't plan on turning the wick or paying for the extra manufacturing cost of the center support two stars.