Product review (2 stars): Caution on this specific filter, Excellent Customer Service
Bought as a replacement for a Honeywell humidifier. It is a good air filter but it is not a good humidifier "wick" (as Honeywell calls it) as compared to the original Honeywell HAC-504AW. This filter has an outer pre-filter that limits the air flow, unlike the original Honeywell. The Honeywell allows much more air to flow through and therefore putting more water/humidity into the air. I mean, this is why I bought the humidifier in the first place. The Honeywell wick put out almost 1 gallon of water per night over 8 hours; this filter has been putting out less than a quart per night. Outside air temperature and humidity over the 8 weeks I have been using the humidifier has not varied all that much (less humid air will absorb more water and I have attempted to non-scientifically account for this).

So, if your goal is to moisten the air, the original Honeywell will serve you better.  However, if you are looking to filter the air AND moisten the air, you can't go wrong with this product.

A final note: even though 30 days had passed, Crucial Air had No Problem understanding my concern, promptly responding to my concern and refunding my money on the two unused filters.  I asked if they had plug-replacement wicks just like the Honeywell and they said no.  However, they took my comments as product improvement ideas and I hope to hear from them in the future notifying me of an identical product to the original.  I will certainly patronize this business again when in need.  They make you feel like a valued customer!