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The Bionaire 900CS is a humidifier wick filter that has been replaced by the compatible RPS CBW9 and fits the following humidifier models:
It can also be used in the Holmes 900 and Holmes 900CS. The Bionaire 900CS compatible evaporative wick humidifier filter replacement measures 7.38" x 8.75" x 2.75".
The Bionaire 900CS compatible humidifier filter uses honeycomb filtration to trap mineral pollutants and other particulates found in water. The evaporative wick feature humidifies without leaving messy white dust.
For best results, the Bionaire 900CS compatible humidifier filter should be changed about twice per season. It is also known by part number UFCBW9.